Back-patch creation of tar.bz2 tarball during "make dist".

Since commit a4d03bbcdaf7739d7e9073ee76bb186f68ddc163, "make dist" has
built both gzip- and bzip2-compressed tarballs.  However, this was
pretty useless, because our tarball build script didn't know about it
and proceeded to overwrite the bz2 file with new data.  Back-patch the
change to all active branches, so that creation of the tar.bz2 file
can be removed from the build script.

GNUmakefile.in

@@ -86,7 +86,7 @@ distdir	= postgresql-$(VERSION)
 dummy	= =install=
 garbage = =*  "#"*  ."#"*  *~*  *.orig  *.rej  core  postgresql-*
 
-dist: $(distdir).tar.gz 
+dist: $(distdir).tar.gz $(distdir).tar.bz2
 ifeq ($(split-dist), yes)
 dist: postgresql-base-$(VERSION).tar.gz postgresql-docs-$(VERSION).tar.gz postgresql-opt-$(VERSION).tar.gz postgresql-test-$(VERSION).tar.gz 
 endif
@@ -96,6 +96,8 @@ dist:
 $(distdir).tar: distdir
 	$(TAR) chf $@ $(distdir)
 
+.INTERMEDIATE: $(distdir).tar
+
 opt_files = \
 	src/tools src/tutorial \
 	$(addprefix src/pl/, plperl plpython tcl)
@@ -134,10 +136,10 @@ distdir:
 	$(MAKE) -C $(distdir) distclean
 	rm -f $(distdir)/README.git
 
-distcheck: $(distdir).tar.gz
+distcheck: dist
 	rm -rf $(dummy)
 	mkdir $(dummy)
-	$(GZIP) -d -c $< | $(TAR) xf -
+	$(GZIP) -d -c $(distdir).tar.gz | $(TAR) xf -
 	install_prefix=`cd $(dummy) && pwd`; \
 	cd $(distdir) \
 	&& ./configure --prefix="$$install_prefix"

src/Makefile.global.in

@@ -476,10 +476,10 @@ TAS         = @TAS@
 	$(CPP) $(CPPFLAGS) -o $@ $<
 
 %.gz: %
-	$(GZIP) -f --best $<
+	$(GZIP) --best -c $< >$@
 
 %.bz2: %
-	$(BZIP2) -f $<
+	$(BZIP2) -c $< >$@
 
 ifndef PGXS