Makefile: stop pretending to support rpmbuild

Nobody in the active development community seems to watch breakages
in the rpmbuild target.  As most major RPM based distros use their
own specfile when packaging us, they aren't looking after us as
their pristine upstream tree, either.  At this point, it is turning
to be a disservice to the users to pretend that our tree natively
supports "make rpmbuild" target when we do not properly maintain it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: gitster

Makefile

@@ -443,7 +443,6 @@ DIFF = diff
 TAR = tar
 FIND = find
 INSTALL = install
-RPMBUILD = rpmbuild
 TCL_PATH = tclsh
 TCLTK_PATH = wish
 XGETTEXT = xgettext
@@ -2396,31 +2395,25 @@ quick-install-html:
 
 ### Maintainer's dist rules
 
-git.spec: git.spec.in GIT-VERSION-FILE
-	sed -e 's/@@VERSION@@/$(GIT_VERSION)/g' < $< > $@+
-	mv $@+ $@
-
 GIT_TARNAME = git-$(GIT_VERSION)
 dist: git.spec git-archive$(X) configure
 	./git-archive --format=tar \
 		--prefix=$(GIT_TARNAME)/ HEAD^{tree} > $(GIT_TARNAME).tar
 	@mkdir -p $(GIT_TARNAME)
-	@cp git.spec configure $(GIT_TARNAME)
+	@cp configure $(GIT_TARNAME)
 	@echo $(GIT_VERSION) > $(GIT_TARNAME)/version
 	@$(MAKE) -C git-gui TARDIR=../$(GIT_TARNAME)/git-gui dist-version
 	$(TAR) rf $(GIT_TARNAME).tar \
-		$(GIT_TARNAME)/git.spec \
 		$(GIT_TARNAME)/configure \
 		$(GIT_TARNAME)/version \
 		$(GIT_TARNAME)/git-gui/version
 	@$(RM) -r $(GIT_TARNAME)
 	gzip -f -9 $(GIT_TARNAME).tar
 
-rpm: dist
-	$(RPMBUILD) \
-		--define "_source_filedigest_algorithm md5" \
-		--define "_binary_filedigest_algorithm md5" \
-		-ta $(GIT_TARNAME).tar.gz
+rpm::
+	@echo >&2 "Use distro packaged sources to run rpmbuild"
+	@false
+.PHONY: rpm
 
 htmldocs = git-htmldocs-$(GIT_VERSION)
 manpages = git-manpages-$(GIT_VERSION)