issue328: _imagingcms.c: include windef.h to fix build issue on MSVC
issue 329: setup.py: better support for C_INCLUDE_PATH, LD_RUN_PATH, etc.
Fix to support colon separated path list, and also support INCLUDE and LIB
environment variable used by MSVC.
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Merge pull request #335 from nu774/issue328

issue328: _imagingcms.c: include windef.h to fix build issue on MSVC
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Merge pull request #336 from nu774/issue329

issue 329: setup.py: better support for C_INCLUDE_PATH, LD_RUN_PATH, etc...
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Wording [ci skip]
Wording [ci skip]