Add missing <stdint.h> header

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[phanirithvij]

@hhirsch This blocks building on Windows when using msys2.

Issue: GlPortal/RadixEngine#199

And there is also one more issue that blocks the build after resolving this.

vhacd-lib/src/btAlignedAllocator.cpp

Line 71 in 1800c26

offset = (alignment - (unsigned long)(real + sizeof(void*))) & (alignment - 1);

There are more issues.

In source/env/util.cpp

  __try
  {
    RaiseException( MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(ULONG_PTR), (ULONG_PTR*)&info );
  }
  __except(EXCEPTION_EXECUTE_HANDLER)
  {
  }

with msys2 it does not recognize __except the fix was to replace it with catch (...) {}

After resolving it got one more

[ 78%] Linking CXX executable ../bin/profiler_sample_disabled_profiler.exe
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/profiler_sample_disabled_profiler.dir/objects.a(main.cpp.obj): in function `profiler::main_thread::frameTimeLocalMax(profiler::Duration)':
D:/Projects/fun/C++/glPortal/external/RadixEngine/external/easy_profiler/easy_profiler_core/include/easy/profiler.h:943: undefined reference to `__imp_main_thread_frameTimeLocalMax'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/profiler_sample_disabled_profiler.dir/objects.a(main.cpp.obj): in function `profiler::main_thread::frameTimeLocalAvg(profiler::Duration)':
D:/Projects/fun/C++/glPortal/external/RadixEngine/external/easy_profiler/easy_profiler_core/include/easy/profiler.h:947: undefined reference to `__imp_main_thread_frameTimeLocalAvg'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: CMakeFiles/profiler_sample_disabled_profiler.dir/objects.a(main.cpp.obj): in function `main':
D:/Projects/fun/C++/glPortal/external/RadixEngine/external/easy_profiler/sample/main.cpp:215: undefined reference to `__imp_startListen'
C:/msys64/mingw64/bin/../lib/gcc/x86_64-w64-mingw32/9.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: D:/Projects/fun/C++/glPortal/external/RadixEngine/external/easy_profiler/sample/main.cpp:258: undefined reference to `__imp_dumpBlocksToFile'
collect2.exe: error: ld returned 1 exit status
mingw32-make[2]: *** [external/RadixEngine/external/easy_profiler/sample/CMakeFiles/profiler_sample_disabled_profiler.dir/build.make:86: external/RadixEngine/external/easy_profiler/bin/profiler_sample_disabled_profiler.exe] Error 1
mingw32-make[1]: *** [CMakeFiles/Makefile2:485: external/RadixEngine/external/easy_profiler/sample/CMakeFiles/profiler_sample_disabled_profiler.dir/all] Error 2
mingw32-make: *** [Makefile:130: all] Error 2

Where I'm stuck at the moment.
Wasted 3 hours trying to build glportal on windows.

Switched to Linux. It works like a charm.