Update ExtUtils-MakeMaker to CPAN version 6.98

Update ExtUtils-MakeMaker to CPAN version 6.98

  [DELTA]

6.98 Tue Apr 29 21:27:59 BST 2014

    No changes from 6.97_02

6.97_02 Mon Apr 28 11:44:56 BST 2014
    Dist fixes:
    * Removed redundant File::Spec check from Makefile.PL

6.97_01 Thu Apr 24 14:23:02 BST 2014
    Bug fixes:
    * Resolve another regression related to not recursing into distdirs

6.96 Fri Apr 11 21:54:25 BST 2014

    No changes from 6.95_02

6.95_02 Mon Apr  7 15:26:20 BST 2014
    Bug fixes:
    * Work-around v5.10.1 for the MIN_PERL_VERSION v-string handling

6.95_01 Wed Apr  2 21:49:22 BST 2014
    Bug fixes:
    * Make MIN_PERL_VERSION handle v-strings properly