Compiling libpq with VisualC

Some modifications are needed to compile libpq with vc6:

fe-connect.c:
- pg_config_paths.h isn't available. SYSCONFDIR is already defined so
fe-connect.c doesn't need to include that.
patch appended

win32.mak:
- pg_config.h must be generated
- port/pgstrcasecmp.c is needed
- port/path.c is not needed
- the current cvs version includes some bogus cr characters, when
checking out with wincvs the file will contain several cr cr lf lines
which will confuse nmake.

Because the last problem might be difficult to handle as diff, I
attached win32.mak as complete file, with all cr stripped so it may be
committed safely with any cvs client.

Regards,
Andreas