Don't clutter build logs.
--- configure.orig	Sat Dec  7 14:14:38 2013
+++ configure	Fri Jan 24 16:17:48 2014
@@ -4582,7 +4582,6 @@ fi
                      -Wcast-qual \
                      -Wextra \
                      -Wpointer-arith \
-                     -Wredundant-decls \
                      -Wreturn-type \
                      -Wshadow \
                      -Wsign-compare \