toolchain/musl: parallelize make install

Signed-off-by: Felix Fietkau <[email protected]>

toolchain/musl/Makefile

@@ -24,7 +24,7 @@ endef
 
 define Host/Install
 	$(call Host/SetToolchainInfo)
-	$(MAKE) $(MUSL_MAKEOPTS) DESTDIR="$(TOOLCHAIN_DIR)/" install
+	+$(MAKE) $(HOST_JOBS) $(MUSL_MAKEOPTS) DESTDIR="$(TOOLCHAIN_DIR)/" install
 	$(CP) ./include $(TOOLCHAIN_DIR)/
 endef