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Resolve directory plugins by platform-neutral name #8

Job	Run time
windows-clang-cl no-exceptions	1m 42s
windows-mingw shared	2m 23s
windows-mingw no-exceptions	2m 8s
windows-mingw static	2m 0s
linux-clang release	48s
windows-msvc no-exceptions	1m 58s
windows-msvc shared	1m 7s
macos no-exceptions	30s
windows-clang-cl release	2m 14s
windows-clang-cl shared	1m 51s
linux-clang shared	45s
macos shared	54s
linux-gcc no-exceptions	37s
linux-gcc static	34s
windows-msvc release	1m 52s
windows-clang-cl static	1m 43s
linux-clang static	1m 1s
macos static	37s
linux-gcc shared	33s
macos release	38s
linux-gcc release	47s
windows-msvc static	1m 17s
	27m 59s