Replace BitKeeper dist target with Git archive

Makefile.in

@@ -90,14 +90,11 @@ dist: tgz
 	make all
 
 tgz:
-	if [ -d BitKeeper ]; then \
-		mkdir ncpfs-$(VERSION) && \
-		bk export -tplain ncpfs-$(VERSION) && \
-		tar cvf - ncpfs-$(VERSION) | (cd .. && gzip -9 > $(DISTFILE)) &&
-		rm -rf ncpfs-$(VERSION); \
+	if [ -d .git ]; then \
+		git archive --format=tar --prefix=ncpfs-$(VERSION)/ HEAD | gzip -9 > ../$(DISTFILE); \
 	else \
 		make distclean; \
-		(cd ..; tar cvf - $(SRCDIR) | gzip -9 > $(DISTFILE)); \
+		(cd ..; tar --exclude='.git' -cvf - $(SRCDIR) | gzip -9 > $(DISTFILE)); \
 	fi
 
 slackware: