Tweaking autotools-based buildsystem for W32 compatibility

[LRN]

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As some of you (who's been on #pidgin) may remember, i've mostly
ignored the usual building instructions, which assume the use of
pre-generated Makefile.mingw makefiles and pre-built binaries for
dependencies.

Anyway, i've successfully built 2.x.y and 3.0.0 on W32 with autotools,
which resulted in a heap of patches on my side (~44 for 3.0.0, ~48 for
2.x.y). How do i go about submitting them? Usually projects frown upon
attaching so many patches to one bugreport/issue/ticket, but creating
40+ tickets (maybe 10+, if i group patches intelligently; that's still
a bit too much, IMO) seems like a bad move too. Especially since some
patches may not be committable as-is (i'm not always patient enough to
come up with a change that fixes the issue for me and does not break
anything for everyone else).

- -- 
O< ascii ribbon - stop html email! - www.asciiribbon.org
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