CMake

Fix missing `unistd.h` header for Cygwin build #2

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Run time

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Job	Run time
macOS Clang	34s
macOS GCC	1m 0s
Windows MSVC Win32	1m 5s
Ubuntu GCC	1m 2s
Windows GCC	1m 15s
Ubuntu Clang	43s
Ubuntu Clang Debug	36s
Windows MSVC Win64	3m 33s
Ubuntu GCC -O3	40s
	10m 28s