Do not treat uninitialized variable warnings as errors in the
auto-generated bison parser code in intl/plural.c.

This was fixed upstream with a regenerated parser as part of this
commit:

commit 568035b7874a099087b77f7bba3e36a1173787b0
Author: Joseph Myers <joseph@codesourcery.com>
Date:   Wed Jan 2 19:01:50 2013 +0000

    Update copyright notices with scripts/update-copyrights.

diff --git a/intl/Makefile b/intl/Makefile
index 39ecb680572bd7ab..f0a7d0d9047ce571 100644
--- a/intl/Makefile
+++ b/intl/Makefile
@@ -45,6 +45,9 @@ plural.c: plural.y
 	$(BISON) $(BISONFLAGS) $@ $^
 endif
 $(objpfx)plural.o: plural.c
+# The generated plural.c file generates unitialized variable warnings
+# with GCC 4.8 on 32-bit architectures.
+CFLAGS-plural.c = -Wno-error=maybe-uninitialized
 
 include ../Rules