QtScript no longer compiles MinGW, gcc 4.9

In file included from c:/mingw/mingw32/i686-w64-mingw32/include/c++/random:51:0,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/algorithm:62,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/RefPtr.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashFunctions.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashTraits.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSValue.h:32,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:33,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc: In member function 'std::gamma_distribution<_RealType>::result_type std::gamma_distribution<_RealType>::operator()(_UniformRandomNumberGenerator&, const std::gamma_distribution<_RealType>::param_type&)':
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2523:14: error: 'wtf_pow' is not a member of 'std'
      return (std::pow(__u, result_type(1.0) / __param.alpha())
              ^
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2523:14: note: suggested alternative:
In file included from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:31:0,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
..\3rdparty\javascriptcore\JavaScriptCore/wtf/MathExtras.h:210:15: note:   'wtf_pow'
 inline double wtf_pow(double x, double y)
               ^
In file included from c:/mingw/mingw32/i686-w64-mingw32/include/c++/random:51:0,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/algorithm:62,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/RefPtr.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashFunctions.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashTraits.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSValue.h:32,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:33,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc: In member function 'void std::gamma_distribution<_RealType>::__generate_impl(_ForwardIterator, _ForwardIterator, _UniformRandomNumberGenerator&, const std::gamma_distribution<_RealType>::param_type&)':
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2589:18: error: 'wtf_pow' is not a member of 'std'
        *__f++ = (std::pow(__u, result_type(1.0) / __param.alpha())
                  ^
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2589:18: note: suggested alternative:
In file included from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:31:0,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
..\3rdparty\javascriptcore\JavaScriptCore/wtf/MathExtras.h:210:15: note:   'wtf_pow'
 inline double wtf_pow(double x, double y)
               ^
In file included from c:/mingw/mingw32/i686-w64-mingw32/include/c++/random:51:0,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/algorithm:62,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/RefPtr.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashFunctions.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashTraits.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSValue.h:32,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:33,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc: In member function 'std::weibull_distribution<_RealType>::result_type std::weibull_distribution<_RealType>::operator()(_UniformRandomNumberGenerator&, const std::weibull_distribution<_RealType>::param_type&)':
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2649:19: error: 'wtf_pow' is not a member of 'std'
  return __p.b() * std::pow(-std::log(result_type(1) - __aurng()),
                   ^
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2649:19: note: suggested alternative:
In file included from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:31:0,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
..\3rdparty\javascriptcore\JavaScriptCore/wtf/MathExtras.h:210:15: note:   'wtf_pow'
 inline double wtf_pow(double x, double y)
               ^
In file included from c:/mingw/mingw32/i686-w64-mingw32/include/c++/random:51:0,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/stl_algo.h:66,
                 from c:/mingw/mingw32/i686-w64-mingw32/include/c++/algorithm:62,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/RefPtr.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashFunctions.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore/wtf/HashTraits.h:24,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSValue.h:32,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:33,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc: In member function 'void std::weibull_distribution<_RealType>::__generate_impl(_ForwardIterator, _ForwardIterator, _UniformRandomNumberGenerator&, const std::weibull_distribution<_RealType>::param_type&)':
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2668:23: error: 'wtf_pow' is not a member of 'std'
    *__f++ = __p.b() * std::pow(-std::log(result_type(1) - __aurng()),
                       ^
c:/mingw/mingw32/i686-w64-mingw32/include/c++/bits/random.tcc:2668:23: note: suggested alternative:
In file included from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.h:31:0,
                 from ..\3rdparty\javascriptcore\JavaScriptCore\runtime\JSImmediate.cpp:22:
..\3rdparty\javascriptcore\JavaScriptCore/wtf/MathExtras.h:210:15: note:   'wtf_pow'
 inline double wtf_pow(double x, double y)
               ^
mingw32-make[3]: *** [obj/debug/debug/JSImmediate.o] Error 1
mingw32-make[2]: *** [debug] Error 2
mingw32-make[1]: *** [sub-script-make_first-ordered] Error 2
mingw32-make: *** [sub-src-make_first] Error 2