[REG 5.12 -> 5.13] x86_64-w64-mingw32-g++-win32 cross build on Linux fails

when trying to build qt 5.13 cross-platform using the x86_64-w64-mingw32-g++-win32 compiler configure.log, a syntax error occurs build.log

bad if use x86_64-w64-mingw32-g++-posix all good

By default, ubuntu uses x86_64-w64-mingw32-g ++ - win32, so this build problem needs to be solved.

Selection Path Priority Status
------------------------------------------------------------

• 0 /usr/bin/x86_64-w64-mingw32-g++-win32 60 auto mode
  1 /usr/bin/x86_64-w64-mingw32-g++-posix 30 manual mode
  2 /usr/bin/x86_64-w64-mingw32-g++-win32 60 manual mode

fix please