[include] autotools.mk: fix autoreconf in subdirectories, thanks field_it for spotting this

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@29835 3c298f89-4303-0410-b956-a3cf2f4a3e73

include/autotools.mk

@@ -43,7 +43,7 @@ define autoreconf
 					$(if $(word 2,$(3)),--no-recursive) \
 					-B $(STAGING_DIR_HOST)/share/aclocal \
 					$(patsubst %,-I %,$(5)) \
-					$(patsubst %,-I %,$(4)) $(4) || true; \
+					$(patsubst %,-I %,$(4)) $(p) || true; \
 			fi; \
 		) \
 	);