CFLAGS: Drop redundant stack-protector.

Signed-off-by: Philip Tricca <philip.b.tricca@intel.com>
diff --git a/configure.ac b/configure.ac
index 00ae655..127cbe8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -60,7 +60,6 @@
 add_cflag([-std=gnu99])
 add_cflag([-Wformat])
 add_cflag([-Wformat-security])
-add_cflag([-Wstack-protector])
 add_cflag([-fstack-protector-all])
 add_cflag([-fpic])
 add_cflag([-fPIC])