contrib: gnutls: publish package deps later (fixes #26520)

The whole Requires.private stanza, not just its value, is expanded by
config.status from the configure script. So the conversion from private
to public must be done after expansion.

contrib/src/gnutls/rules.mak

@@ -37,7 +37,6 @@ gnutls: gnutls-$(GNUTLS_VERSION).tar.xz .sum-gnutls
 	# fix i686 UWP builds as they were using CertEnumCRLsInStore via invalid LoadLibrary
 	$(APPLY) $(SRC)/gnutls/0001-fix-mingw64-detection.patch
 
-	$(call pkg_static,"lib/gnutls.pc.in")
 	$(UPDATE_AUTOCONFIG)
 	$(MOVE)
 
@@ -80,6 +79,7 @@ endif
 
 .gnutls: gnutls
 	cd $< && $(GNUTLS_ENV) ./configure $(GNUTLS_CONF)
+	$(call pkg_static,"lib/gnutls.pc")
 	cd $< && $(MAKE) -C gl install
 	cd $< && $(MAKE) -C lib install
 	touch $@