Fix missing include <cstdint>

[Eisenwave]

std::int8_t is used, but not included through #include <cstdint>.

This may work in some standard libraries because it is leaked through another header, but not in all. I have seen this cause a problem for a user in our programming community on Discord:

[DanielChappuis]

Thanks a lot for your contribution. I will integrate this for the next release of the library.

[TheBoneJarmer]

Hey, perhaps interesting to share. Today I tried compiling ReactPhysics3D on Windows using mingw and cmake, which failed exactly because of this error. I run the command cmake -S .. -DBUILD_SHARED_LIBS=ON -G "MinGW Makefiles followed by cmake --build . . This results in a lot of errors starting with this one. Stupidly enough, it works fine with the MSVC compiler.

Maybe an idea, depending on your scheduled release date for v1.0.0, to include this info somewhere in the readme and/or the docs until further notice?

EDIT:

I just applied this fix locally and rp3d builds fine now using above instructions. :)

[ktrace]

Keep mind, that changes in #360 too.

[DanielChappuis]

Thanks for your pull request. It has been merged into the "develop" branch and will be part of the next release of the library.