build: permit incremental linking on Windows #230

Job	Run time
linter	1m 10s
linux (-DCMARK_SHARED=ON, clang, clang++)	26s
macos (-DCMARK_SHARED=ON, clang, clang++)	1m 14s
linux (-DCMARK_SHARED=ON, gcc, g++)	43s
windows (-DCMARK_SHARED=ON)	1m 40s
macos (-DCMARK_SHARED=ON, gcc, g++)	1m 19s
windows	1m 9s
linux (clang, clang++)	2m 20s
macos (clang, clang++)	1m 43s
linux (gcc, g++)	1m 55s
macos (gcc, g++)	1m 5s
	14m 44s

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