OpenXRUtilities C API fixes #3539

Job	Run time
Linux -> Pre-checks	17s
Linux -> GCC-x64, Debug	12m 41s
Linux -> Clang-x64, Release	13m 11s
Linux -> Clang-x64, Debug	13m 56s
Linux -> Clang-NO_GLSLANG-NO_HLSL-x64, Release	6m 21s
Linux -> Clang-NO_GLSLANG-x64, Debug	8m 10s
Linux -> GCC-x64, Release	13m 16s
	1h 7m 52s

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