musl: as it builds it's own libssp, disable gcc's

Signed-off-by: Alejandro Mery <amery@geeks.cl>

base/musl/parse-config

@@ -12,8 +12,11 @@
 # GNU General Public License can be found in the file COPYING.
 # --- SDE-COPYRIGHT-NOTE-END ---
 
-if [ "$SDECFG_LIBC" == "musl" ]; then
+if [ "$SDECFG_LIBC" = "musl" ]; then
 	if atstage cross; then
 		var_append configcachefile ' ' "$base/package/*/musl/share/config.cache"
 	fi
+	if [ "$pkg" = gcc ]; then
+		var_append extraconfopt ' ' '--disable-libssp'
+	fi
 fi