legal-info: depend on patch rather than extract

Switch legal-info generation dependency to patch rather than extract
so we can use debian/copyright from debian-maintained packages,
because the *orig* file alone doesn't contain the appropiate file.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/pkg-generic.mk

@@ -629,7 +629,7 @@ $(2)_MANIFEST_LICENSE_FILES ?= not saved
 # for overriden, local or normal remote packages alike, whether
 # we want to redistribute it or not.
 ifneq ($$($(2)_LICENSE_FILES),)
-$(1)-legal-info: $(1)-extract
+$(1)-legal-info: $(1)-patch
 endif
 
 # We only save the sources of packages we want to redistribute, that are