common.mk: force updating revision.h on each commit

by making .revision.time PHONY. Prior to this commit, RUBY_DESCRIPTION
has been updated only when version.h (or tool/file2lastrev.rb) is updated.

.revision.time (REVISION_H) target internally has IFCHANGE to update
revision.h. So it doesn't touch revision.h when it's not updated,
and thus it's safe to run every time.

defs/gmake.mk: drop obsoleted reference to REVISION_FORCE

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65692 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

common.mk

@@ -1052,7 +1052,7 @@ preludes: {$(srcdir)}golf_prelude.c
 $(srcdir)/revision.h:
 	@exit > $@
 
-$(REVISION_H): $(srcdir)/version.h $(srcdir)/tool/file2lastrev.rb $(REVISION_FORCE)
+$(REVISION_H): $(srcdir)/version.h $(srcdir)/tool/file2lastrev.rb PHONY
 	-$(Q) $(BASERUBY) $(srcdir)/tool/file2lastrev.rb -q --revision.h "$(srcdir)" > revision.tmp
 	$(Q)$(IFCHANGE) "--timestamp=$@" "$(srcdir)/revision.h" revision.tmp
 
@@ -1168,7 +1168,7 @@ dist:
 up:: update-remote
 
 up::
-	-$(Q)$(MAKE) $(mflags) Q=$(Q) REVISION_FORCE=PHONY "$(REVISION_H)"
+	-$(Q)$(MAKE) $(mflags) Q=$(Q) "$(REVISION_H)"
 
 up::
 	-$(Q)$(MAKE) $(mflags) Q=$(Q) after-update

defs/gmake.mk

@@ -150,7 +150,7 @@ commit: $(if $(filter commit,$(MAKECMDGOALS)),$(filter-out commit,$(MAKECMDGOALS
 	} | \
 	$(MAKE) $(mflags) Q=$(Q) srcdir="$(srcdir)" srcs_vpath="$(srcdir)/" CHDIR="$(CHDIR)" \
 		BOOTSTRAPRUBY="$(BOOTSTRAPRUBY)" MINIRUBY="$(BASERUBY)" BASERUBY="$(BASERUBY)" \
-		VCSUP="" ENC_MK=.top-enc.mk REVISION_FORCE=PHONY CONFIGURE="$(CONFIGURE)" -f - \
+		VCSUP="" ENC_MK=.top-enc.mk CONFIGURE="$(CONFIGURE)" -f - \
 		update-src srcs all-incs
 
 ifeq ($(words $(filter update-gems extract-gems,$(MAKECMDGOALS))),2)