Use -Wformat=2 by default for all files.

This just makes sure that all format strings are given as literals to
printf like functions so the compiler can see and check them. Remove
all no_Wformat, add -Wformat=2 unconditionally to AM_CFLAGS.

Signed-off-by: Mark Wielaard <mjw@redhat.com>
diff --git a/tests/ChangeLog b/tests/ChangeLog
index aa468c4..cbf2672 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,7 @@
+2014-01-22  Mark Wielaard  <mjw@redhat.com>
+
+	* Makefile.am (line2addr_no_Wformat): Removed.
+
 2014-01-21  Mark Wielaard  <mjw@redhat.com>
 
 	* Makefile.am (TESTS): Add run-stack-i-test.sh.