This allows to add extra manifest for the pkgdepend resolve step to get native
dependency on unversioned runtime/perl.

--- illumos-gate/usr/src/pkg/Makefile.orig
+++ illumos-gate/usr/src/pkg/Makefile
@@ -411,7 +411,7 @@
 	else \
 		print "Resolving dependencies"; \
 		pkgdepend -R $(PKGDEP_RESOLVE_IMAGE) resolve \
-		    -m $(DEP_SYNTH_PKGS) $(DEP_PKGS); \
+		    -m $(DEP_SYNTH_PKGS) $(DEP_PKGS) $(DEP_RUNTIME_PERL); \
 		for p in $(DEP_SYNTH_PKGS:%.dep=%) $(DEP_PKGS:%.dep=%); do \
 			if [ "$$(print $$p.metadata.*)" = \
 			     "$$(print $$p.metadata.noincorp.*)" ]; \