TESTS_ENVIRONMENT set LC_ALL and LANG to C.

Some tests rely on sort order and output of tools that might be localized.

Reported-by: Paweł Sikora <pluto@pld-linux.org>
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 4c6e9f7..841742d 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2012-05-11  Mark Wielaard  <mjw@redhat.com>
+
+	* Makefile.am (TESTS_ENVIRONMENT): Set LC_ALL and LANG to C.
+
 2012-05-07  Mark Wielaard  <mjw@redhat.com>
 
 	* low_high_pc.c: Allow highpc == lowpc for CU DIEs for buggy GCC.