look the path!

Today I fix a stupid, trivial issue on building a win32 executable from python code... the problem was a missing library, but the library was in the correct place!!! Al last, I fund there are two python interpreter on my machine, the one I installed and another... installed by cygwin!!! Clearly, when I write "python.exe" on my prompt the first interpreter the system find is the cygwin one, that hasn't the libraries I need... just add the correct path and the issue disappeared!