[network-manager-openvpn] build: turn off set-but-not-used variable warnings in new gcc

[Jiří Klimeš <jklimes src gnome org>]

commit 959f5fdbf558523393552efa3ad80dc5247ccf1d
Author: JiÅ?í KlimeÅ¡ <jklimes redhat com>
Date:   Fri Feb 11 14:18:04 2011 +0100

    build: turn off set-but-not-used variable warnings in new gcc

 m4/compiler_warnings.m4 |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/m4/compiler_warnings.m4 b/m4/compiler_warnings.m4
index 6cea2f7..be69af2 100644
--- a/m4/compiler_warnings.m4
+++ b/m4/compiler_warnings.m4
@@ -10,7 +10,7 @@ if test "$GCC" = "yes" -a "$set_more_warnings" != "no"; then
 	for option in -Wshadow -Wmissing-declarations -Wmissing-prototypes \
 		      -Wdeclaration-after-statement -Wstrict-prototypes \
 		      -Wfloat-equal -Wno-unused-parameter -Wno-sign-compare \
-		      -fno-strict-aliasing; do
+		      -fno-strict-aliasing -Wno-unused-but-set-variable; do
 		SAVE_CFLAGS="$CFLAGS"
 		CFLAGS="$CFLAGS $option"
 		AC_MSG_CHECKING([whether gcc understands $option])