QtOpenGL should use stdint.h also on Windows with MSVC

Microsoft Visual C++ starting with version 10 AKA 2010 supports stdint.h.

When I use VC12 and QT_NAMESPACE=XXX, I get the following error:
MyTest.cpp(40) : error C2872: 'int32_t' : ambiguous symbol
could be 'C://Developer/VC12/VC/include\stdint.h(10) : int int32_t'
or 'y:\depot\qt\qtbase-opensource-src\include\qtgui\../../src/gui/opengl/qopengl.h(227) : XXX::int32_t'

The problem does not exist when QT_NAMESPACE is not used.
When I look at src/gui/opengl/qopengl.h and qopenglext.h, I see that stdint.h is never used with MSVC. When corrected, the build problem is gone. I believe stdint.h should be used whenever available.
Please find attached two simple patch files solving this issue.