Missing header includes & MinGW fixes #2719

Job	Run time
macos-arm64-internal-release	8m 48s
Check for Max SDK	1s
linux-x64-internal-release	24m 18s
macos-arm64-internal-debug	7m 47s
linux-x64-internal-debug	21m 25s
macos-arm64-external-release	7m 53s
linux-x64-external-release	23m 58s
macos-x64-internal-release	40m 42s
macos-x64-internal-debug	34m 25s
macos-x64-external-release	40m 7s
windows-x86-internal-release	18m 35s
windows-x86-internal-debug	13m 24s
windows-x86-external-release	16m 52s
maxplugin-${{ matrix.cfg.str }}-${{ matrix.cfg.sdk-version }}	0s
windows-x64-internal-release	17m 38s
windows-x64-internal-debug	15m 24s
windows-x64-external-release	15m 33s
	5h 6m 50s

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