Update Extutils-MakeMaker to CPAN version 6.80

  [DELTA]

6.80 Tue Oct 15 16:04:50 BST 2013

    No changes from 6.79_04

6.79_04 Fri Oct 11 18:57:51 BST 2013
    Bug fixes:
    * Add CP_NONEMPTY to the list of tools in Makefile

6.79_03 Fri Oct 11 13:56:53 BST 2013
    Bug fixes:
    * don't copy .bs portably :)

6.79_02 Fri Oct 11 12:58:01 BST 2013
    Bug fixes:
    * RT#28992 don't copy .bs files if they are empty