Move windows headers to port.c #3036

Job	Run time
WIN32 MSVC	2m 5s
WIN32 MingW	2m 30s
Native GCC (macos-latest)	2m 14s
GNU MSP430 Toolchain	1m 37s
Native GCC (ubuntu-latest)	1m 30s
CMake Example with Native GCC	39s
GNU ARM Toolchain	1m 52s
GCC MicroBlaze Toolchain	3m 7s
	15m 34s

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