package update for cygwin CMake

[Tony Kelman]

>> The same number of CMake unit tests passed with an unpatched bootstrap
>> straight from the upstream sources, so I didn't get the entire rationale.
>>
>> -Tony
>
> PathCygwinToWin32 was using a deprecated cygwin_conv_to_win32
> that is not present in x86_64 version of cygwin.

I've updated this set of patches for cmake 3.1.0-rc2 (I can post the builds
if anyone would like to test them) at 
https://github.com/tkelman/cygwin-cmake
As with 3.0.2, there is no difference in the number of CMake's self-tests
that fail with unpatched sources from upstream vs applying Yaakov's set of
patches (with my updates so they apply to the latest version). I don't
see anything using cygwin_conv_to_win32 in 3.x, there are some uses of
cygwin_conv_path which are disabled by Yaakov's patches however.

I'm still willing to adopt the package, it appears Bill has been too busy
to upload a more recent version over the past 6 weeks.

Yaakov (or anyone else), is there any way you can provide test cases
that would fail without applying each of these patches? I can pursue
adding such cases to CMake's test suite and working to get the patches
incorporated upstream.

Thanks,
Tony


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