Fix GetModuleFileNameA to understand that its first param is a HMODULE.

This is needed because on a 64-bit build of Python on Windows the handles
may be 8-byte values (a void*) but the ctypes default is to assume int,
which is only 4 bytes.
Merge pull request #59 from RobinD42/fix-upstream-Win64-GetModuleFileNameA

Fix GetModuleFileNameA to understand that its first param is a HMODULE.