[win32] bump to Python 2.7.5 and PIL-1.1.7.win32-py2.7
[win32] remove obsolete python24.dll code
Merge pull request #3318 from MartijnKaijser/win32_python2.7.5

[win32] bump python version to 2.7.5 and PIL-1.1.7.win32-py2.7