fio needs to not hardwire python2.6

*** 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
   #
   #  Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
   #  Author: Erwan Velu  <erwan@enovance.com>
  @@ -401,9 +401,9 @@
       force_keep_temp_files=False
--- 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/python
   #
   #  Copyright (C) 2013 eNovance SAS <licensing@enovance.com>
   #  Author: Erwan Velu  <erwan@enovance.com>
  @@ -401,9 +401,9 @@
       force_keep_temp_files=False