common/hooks: add some hooks moved from xbps-src (not yet used).

common/hooks/pre-configure/musl-override-configsub.sh

@@ -0,0 +1,13 @@
+# This hook overrides config.sub for musl builds.
+
+hook() {
+	case "$XBPS_TARGET_MACHINE" in
+		*-musl);;
+		*) return 0;;
+	esac
+	if [ "$build_style" = "gnu-configure" ]; then
+		for f in $(find ${wrksrc} -type f -name *config*.sub); do
+			cp -f ${XBPS_CROSSPFDIR}/config.sub ${f}
+		done
+	fi
+}