please remove huge ghc-tarballs/

Just prior to ghc-6.12 RC2 the ghc tarball sizes ballooned:

  -rw-r--r--  7821334 2009-11-17 12:27 ghc-6.12.0.20091116-src.tar.bz2
  -rw-r--r--  7822080 2009-11-18 18:37 ghc-6.12.0.20091117-src.tar.bz2
  -rw-r--r-- 25473470 2009-11-19 10:30 ghc-6.12.0.20091118-src.tar.bz2
  -rw-r--r-- 22538103 2009-11-23 14:14 ghc-6.12.0.20091121-src.tar.bz2

This is largely due to the addition of ghc-tarballs/ and particularly mingw/. Can't mingw/ and perl/ go into a separate extra tarball for people who should want to build on Windows if the ghc project really needs to ship them? This addition really bloats the src distribution in a big way.

Trac metadata

Trac field	Value
Version	6.12.1 RC1
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Build System
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