Makefile: Fix warning: jobserver unavailable: using -j1.  Add '+' to parent make rule.
@@ -52,13 +52,13 @@ all: $(BIN)
.PRECIOUS: $(BIN)
define MAKE_template
- $(Q) cd $(1) && $(MAKE) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
+ +$(Q) $(MAKE) -C $(1) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
endef
define SDIR_template
$(1)_$(2):
- $(Q) cd $(1) && $(MAKE) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
+ +$(Q) $(MAKE) -C $(1) $(2) TOPDIR="$(TOPDIR)" APPDIR="$(APPDIR)"
endef
