Fixing header guards #537

Job	Run time
Check for Max SDK	3s
macos-x64-internal-release	24m 40s
linux-x64-internal-release	10m 30s
macos-x64-internal-debug	21m 23s
linux-x64-internal-debug	11m 33s
macos-x64-external-release	13m 21s
linux-x64-external-release	9m 23s
windows-x86-internal-release	18m 34s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x86-internal-debug	16m 12s
windows-x86-external-release	22m 19s
windows-x64-internal-release	16m 40s
windows-x64-internal-debug	14m 38s
windows-x64-external-release	21m 19s
	3h 20m 35s

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