[patch] Workaround for ar and ld for Windows cmdline length restriction

[Esa Ilari Vuokko]

Hi

I have prepared a patch that works around Windows 32k command line
length restriction when invoking ar and ld, this makes using
ghc's split-objs possible in practice.

Tue May  9 04:15:32 FLE Daylight Time 2006  Esa Ilari Vuokko
<ei at vuokko.info>
  * Workaround for ar and ld for Windows cmdline length restriction

There is no guarantee that algorithm works, ideally I should
cut the lines at 32k, but instead I just call ar/ld for each one
hundred files.  Ld's case is a bit more complicated, with temp
files.

Algorithms aren't perfect, but I think they fit practically all
packages out there (who has path to object file longer than
320+ characters, and hundred more?)

Better solution would be to use ar's and ld's @file-functionality,
but this isn't available in mingw's stable (or whatever) binutils
yet, and of course builds for 6.4.x series will never have them, so
it'd need ar/ld version checking which isn't totally trivial to add.

Best regards,
--Esa

PS. Please CC me on replies as I am not subscribed.
PSS. It seems to me that indentation in source has both tabs and
  spaces.  That feels risky.
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