[CMake] try_compile additional include FILES

[J Decker]

I've been playing with libressl; which has quite a few
'check_function_exists'

In particular 'check-function-exists( inet_pton HAVE_INET_PTON )'

this is failing, because, directly, there is no 'inet_pton' in windows, but
by including ws2tcpip.h there is a #define that changes it to InetPton[A/W]

but I don't see any way to specify additional files to include.
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