Fixing header guards #536

Job	Run time
Check for Max SDK	1s
macos-x64-internal-release	21m 33s
macos-x64-internal-debug	15m 11s
linux-x64-internal-release	30m 19s
macos-x64-external-release	23m 23s
linux-x64-internal-debug	28m 9s
linux-x64-external-release	25m 51s
windows-x86-internal-release	1h 16m 40s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x86-internal-debug	51m 52s
windows-x86-external-release	56m 57s
windows-x64-internal-release	1h 0m 19s
windows-x64-internal-debug	53m 45s
windows-x64-external-release	56m 39s
	8h 20m 39s

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