mesa: Fix some quirkiness of make tarballs

Among other benefits, parallel makes now work.  Since many people have
parallel builds by default (via MAKEFLAGS environment variable), this
sames some irritation at release time...when there's usually not any
other irritation already.
diff --git a/Makefile b/Makefile
index b22c18f..3ff1ae6 100644
--- a/Makefile
+++ b/Makefile
@@ -421,9 +421,15 @@
 
 
 # Everything for new a Mesa release:
-tarballs: rm_depend configure aclocal.m4 lib_gz glut_gz \
-	lib_bz2 glut_bz2 lib_zip glut_zip md5
+ARCHIVES = $(LIB_NAME).tar.gz \
+	$(LIB_NAME).tar.bz2 \
+	$(LIB_NAME).zip \
+	$(GLUT_NAME).tar.gz \
+	$(GLUT_NAME).tar.bz2 \
+	$(GLUT_NAME).zip
 
+tarballs: rm_depend configure aclocal.m4 md5
+	rm -f ../$(LIB_NAME).tar
 
 # Helper for autoconf builds
 ACLOCAL = aclocal
@@ -445,43 +451,37 @@
 	rm -f configs/current
 	rm -f configs/autoconf
 
-lib_gz: rm_config
-	cd .. ; \
-	tar -cf $(LIB_NAME).tar $(LIB_FILES) ; \
-	gzip $(LIB_NAME).tar ; \
-	mv $(LIB_NAME).tar.gz $(DIRECTORY)
+$(LIB_NAME).tar: rm_config
+	cd .. ; tar -cf $(DIRECTORY)/$(LIB_NAME).tar $(LIB_FILES)
 
-glut_gz:
-	cd .. ; \
-	tar -cf $(GLUT_NAME).tar $(GLUT_FILES) ; \
-	gzip $(GLUT_NAME).tar ; \
-	mv $(GLUT_NAME).tar.gz $(DIRECTORY)
+$(LIB_NAME).tar.gz: $(LIB_NAME).tar
+	gzip --stdout --best $(LIB_NAME).tar > $(LIB_NAME).tar.gz
 
-lib_bz2: rm_config
-	cd .. ; \
-	tar -cf $(LIB_NAME).tar $(LIB_FILES) ; \
-	bzip2 $(LIB_NAME).tar ; \
-	mv $(LIB_NAME).tar.bz2 $(DIRECTORY)
+$(GLUT_NAME).tar:
+	cd .. ; tar -cf $(DIRECTORY)/$(GLUT_NAME).tar $(GLUT_FILES)
 
-glut_bz2:
-	cd .. ; \
-	tar -cf $(GLUT_NAME).tar $(GLUT_FILES) ; \
-	bzip2 $(GLUT_NAME).tar ; \
-	mv $(GLUT_NAME).tar.bz2 $(DIRECTORY)
+$(GLUT_NAME).tar.gz: $(GLUT_NAME).tar
+	gzip --stdout --best $(GLUT_NAME).tar > $(GLUT_NAME).tar.gz
 
-lib_zip: rm_config
+$(LIB_NAME).tar.bz2: $(LIB_NAME).tar
+	bzip2 --stdout --best $(LIB_NAME).tar > $(LIB_NAME).tar.bz2
+
+$(GLUT_NAME).tar.bz2: $(GLUT_NAME).tar
+	bzip2 --stdout --best $(GLUT_NAME).tar > $(GLUT_NAME).tar.bz2
+
+$(LIB_NAME).zip: rm_config
 	rm -f $(LIB_NAME).zip ; \
 	cd .. ; \
 	zip -qr $(LIB_NAME).zip $(LIB_FILES) ; \
 	mv $(LIB_NAME).zip $(DIRECTORY)
 
-glut_zip:
+$(GLUT_NAME).zip:
 	rm -f $(GLUT_NAME).zip ; \
 	cd .. ; \
 	zip -qr $(GLUT_NAME).zip $(GLUT_FILES) ; \
 	mv $(GLUT_NAME).zip $(DIRECTORY)
 
-md5:
+md5: $(ARCHIVES)
 	@-md5sum $(LIB_NAME).tar.gz
 	@-md5sum $(LIB_NAME).tar.bz2
 	@-md5sum $(LIB_NAME).zip
@@ -489,7 +489,4 @@
 	@-md5sum $(GLUT_NAME).tar.bz2
 	@-md5sum $(GLUT_NAME).zip
 
-.PHONY: tarballs rm_depend rm_config md5 \
-	lib_gz glut_gz \
-	lib_bz2 glut_bz2 \
-	lib_zip glut_zip
+.PHONY: tarballs rm_depend rm_config md5