graphics/openxr: new port - required for games/lwjgl3

[vvd]

Summary

This port required for build lwjgl 3, and lwjgl 3 required for Java Minecraft Client 1.20.x run on FreeBSD without linux compatibility layer.

Tested build in poudriere and in live system 13.2-p10 amd64.
Also test build lwjgl 3.

Some details are here: https://github.com/LWJGL/lwjgl3/issues/421#issuecomment-1964114740

[vvd]

https://github.com/KhronosGroup/OpenXR-SDK-Source/issues/241#issuecomment-1966404332

[vvd]

Forgot to remove unused USE_LDCONFIG=yes.

[arrowd]

Remember to add this new port to the category Makefile.