Makefiles for building with mingw32 on win32

Makefiles for building the win32 parts with the native (mingw32) mode of gcc.
Currently, only libpq is implemented because I only cared for that :-)
Supports cross-compilation and includes documentation updates. So people don't
need to spend big $$$ for Visual C++ :-)

Gerhard
--
mail: gerhard <at> bigfoot <dot> de registered Linux user #64239
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reduce(lambda x,y:x+y,map(lambda x:chr(ord(x)^42),tuple('zS^BED\nX_FOY\x0b')))