pkg-{download, generic}: remove source-check

This feature is not used by anyone in the core developpers and makes a
drastic simplification of the pkg-download infrastructure harder.

The future patch will move much of what's in the current pkg-download.mk
file into the dl-wrapper which is a shell script.

Signed-off-by: Maxime Hadjinlian <maxime.hadjinlian@gmail.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Makefile

@@ -141,7 +141,7 @@ noconfig_targets := menuconfig nconfig gconfig xconfig config oldconfig randconf
 # We're building in two situations: when MAKECMDGOALS is empty
 # (default target is to build), or when MAKECMDGOALS contains
 # something else than one of the nobuild_targets.
-nobuild_targets := source %-source source-check \
+nobuild_targets := source %-source \
 	legal-info %-legal-info external-deps _external-deps \
 	clean distclean help show-targets graph-depends \
 	%-graph-depends %-show-depends %-show-version \
@@ -758,10 +758,6 @@ _external-deps: $(foreach p,$(PACKAGES),$(p)-all-external-deps)
 external-deps:
 	@$(MAKE1) -Bs $(EXTRAMAKEARGS) _external-deps | sort -u
 
-# check if download URLs are outdated
-.PHONY: source-check
-source-check: $(foreach p,$(PACKAGES),$(p)-all-source-check)
-
 .PHONY: legal-info-clean
 legal-info-clean:
 	@rm -fr $(LEGAL_INFO_DIR)
@@ -1048,7 +1044,6 @@ help:
 	@echo
 	@echo 'Miscellaneous:'
 	@echo '  source                 - download all sources needed for offline-build'
-	@echo '  source-check           - check selected packages for valid download URLs'
 	@echo '  external-deps          - list external packages used'
 	@echo '  legal-info             - generate info about license compliance'
 	@echo '  printvars              - dump all the internal variables'