Added refresh-gems

Refreshes bundled gems to the latest version, and extracts them.

common.mk

@@ -1243,6 +1243,8 @@ update-config_files: PHONY
 	$(Q) $(BASERUBY) -C "$(srcdir)" tool/downloader.rb -d tool --cache-dir=$(CACHE_DIR) -e gnu \
 	    config.guess config.sub
 
+refresh-gems: update-bundled_gems update-gems extract-gems
+
 update-gems: PHONY
 	$(ECHO) Downloading bundled gem files...
 	$(Q) $(BASERUBY) -C "$(srcdir)" \

defs/gmake.mk

@@ -241,8 +241,15 @@ HELP_EXTRA_TASKS = \
 	"  update-github:       merge master branch and push it to Pull Request [PR=1234]" \
 	""
 
-ifeq ($(words $(filter update-gems extract-gems,$(MAKECMDGOALS))),2)
+ifneq ($(filter refresh-gems,$(MAKECMDGOALS)),)
 extract-gems: update-gems
+update-gems: update-bundled_gems
+endif
+ifneq ($(filter extract-gems,$(MAKECMDGOALS)),)
+extract-gems: $(filter update-gems update-bundled_gems,$(MAKECMDGOALS))
+endif
+ifneq ($(filter update-gems,$(MAKECMDGOALS)),)
+update-gems: $(filter update-bundled_gems,$(MAKECMDGOALS))
 endif
 
 ifeq ($(filter 0 1,$(words $(arch_flags))),)