fio needs to not hardwire python2.6

@@ -1,11 +1,11 @@
 diff -bur fio-2.1.10.pristine/tools/plot/fio2gnuplot fio-2.1.10/tools/plot/fio2gnuplot
 --- fio-2.1.10.pristine/tools/plot/fio2gnuplot  2014-06-10 15:18:38.000000000 -0400
 +++ fio-2.1.10/tools/plot/fio2gnuplot   2014-07-29 13:02:35.000000000 -0400
 @@ -1,4 +1,4 @@
 -#!/usr/bin/env python
-+#!/usr/bin/python2.6
++#!/usr/bin/python
  #
  #  Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
  #  Author: Erwan Velu  <erwan@enovance.com>
 @@ -401,9 +401,9 @@
      force_keep_temp_files=False