win32 v4

[Robert Collins]

This should be ok now. With 2 exceptions:

the AC_REQUIRE lines were causing a problem - so I've dnl'd them barring
some feedback from a more m4 knowedgable person.

I'm a little unsure whether overriding both CPPFLAGS and CFLAGS is a
good idea, but the reason is that non automake makefile.in's may not use
CPPFLAGS, so CFLAGS does need to be set. Not setting CPPFLAGS results in
AC_CHECK_HEADER tests for win32 headers failing. The upshot is that in
automake environments -mwin32 is added twice...

If there's an easy way to test for the presence of automake in the
macro, I could make this conditional... I'll visit the automake doco in
more detail later today...

Rob
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