makeapi: enforce en_US.UTF-8 locale when sorting API files

Collation should be the same for API files or we will end up with
differences between development environments.

Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
Reviewed-By: Rob Crittenden <rcritten@redhat.com>
Reviewed-By: David Hanina <dhanina@redhat.com>

makeapi.in

@@ -25,6 +25,8 @@
 
 from __future__ import print_function
 
+import locale
+import platform
 import importlib
 import itertools
 import sys
@@ -680,6 +682,9 @@ def validate_api_reference():
     return rval
 
 def main():
+    if platform.system() == "Linux":
+        locale.setlocale(locale.LC_ALL, 'en_US.UTF-8')
+
     rval = 0
     options, _args = parse_options()