[PATCH 0 of 1 STABLE] color: port to using ctypes (issue2687)

[Adrian Buehlmann]

Could somebody on Linux please check if the color extension still works ok
with this?

The testsuite ran ok, but I'd bet that doesn't mean much.

I've tested only on Windows 7 x64 (manual tests), using

  Python 2.6.6 (r266:84297, Aug 24 2010, 18:13:38) [MSC v.1500 64 bit (AMD64)] on win32

Would be nice if someone else on Windows could confirm this works ok on
Windows.

Thanks.