Fixes #558: Now `WINDOWS_EXPORT_ALL_SYMBOLS` just for our targets; an… #529

Job	Run time
build (ubuntu-20.04, 12.1, 10, bash, Unix Makefiles)	1m 6s
build (ubuntu-20.04, 12.0, 10, bash, Unix Makefiles)	1m 2s
build (ubuntu-20.04, 11.8, 10, bash, Unix Makefiles)	1m 1s
build (ubuntu-20.04, 11.7, 10, bash, Unix Makefiles)	1m 3s
build (ubuntu-20.04, 11.6.2, 10, bash, Unix Makefiles)	1m 3s
build (ubuntu-20.04, 11.6.1, 10, bash, Unix Makefiles)	1m 0s
build (ubuntu-20.04, 11.6, 10, bash, Unix Makefiles)	1m 0s
build (ubuntu-20.04, 11.5, 10, bash, Unix Makefiles)	1m 1s
build (ubuntu-20.04, 11.4, 10, bash, Unix Makefiles)	1m 2s
build (ubuntu-20.04, 11.3, 9, bash, Unix Makefiles)	1m 4s
build (ubuntu-20.04, 11.2, 9, bash, Unix Makefiles)	1m 0s
build (ubuntu-20.04, 11.1, 9, bash, Unix Makefiles)	53s
build (ubuntu-20.04, 11.0, 9, bash, Unix Makefiles)	53s
	13m 8s

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