extract_utils: Fix locale issue with sort

* On some machines, LC_ALL=C is set, causing the sort
  order of makefiles to be different than those without
  this locale change that is set
* Set LC_ALL=C on all machines for consistent ordering
* From 'man sort':
  The locale specified by the environment affects sort order.
  Set LC_ALL=C to get the traditional sort order that uses native byte values.
* Thanks to haggertk and rashed for verifying this for me

Change-Id: I5bbb94b0dfe599a67036de4312e8af913e9b8d30
Signed-off-by: Paul Keith <javelinanddart@aidenswann.com>