quilt.mk: export PATCH for patch-kernel.sh

SVN-Revision: 23315

include/quilt.mk

@@ -40,6 +40,7 @@ endef
 
 define PatchDir/Default
 	@if [ -d "$(2)" -a "$$$$(ls $(2) | wc -l)" -gt 0 ]; then \
+		export PATCH="$(PATCH)"; \
 		if [ -s "$(2)/series" ]; then \
 			$(call filter_series,$(2)/series) | xargs -n1 \
 				$(KPATCH) "$(1)" "$(2)"; \