patch applied (ghc): Unset $CFLAGS for "GNU non-executable stack" configure test; fixes #3889

[Ian Lynagh]

Fri May 21 09:50:05 PDT 2010  Ian Lynagh <igloo at earth.li>
  * Unset $CFLAGS for "GNU non-executable stack" configure test; fixes #3889
  With gcc 4.4 we get
      Error: can't resolve `.note.GNU-stack' {.note.GNU-stack section} - `.Ltext0' {.text section}
  when running gcc with the -g flag. To work around this we unset
  CFLAGS when running the test.

    M ./configure.ac +6

View patch online:
http://darcs.haskell.org/cgi-bin/darcsweb.cgi?r=ghc;a=darcs_commitdiff;h=20100521165005-3fd76-de1e276f1df5e47357a270d3163e39844e216906.gz