patch applied (ghc): * Future-proof autoconf's Perl version test.

[Audrey Tang]

Wed Jul 11 09:58:51 PDT 2007  audreyt at audreyt.org
  * * Future-proof autoconf's Perl version test.
  
    GHC only works with Perl versions 5.6 and later; however
    the current test greps in a rather non-future-proof way
    (explicitly against 5.6 and 5.8).
    
    We instead exploit the "v-string" change in 5.6, which
    displays the version string as "v5.x.y", rather than
    the earlier format "version 5.xxx_yyy".  Hence grepping
    against "v5" will make it future proof for a while.
    (At least until Perl 6 is installed as the system perl.)
  

    M ./aclocal.m4 -11 +6