build-sys: simplify git tar invocation

git is nowadays nice enough to compress based on the output file suffix,
let's make use of that.

diff --git a/Makefile.am b/Makefile.am
index b4150041936d4d4e51bcce427b1499cda1d81ed7..407efab45e4c0274878ab95587526186bef14e02 100644 (file)
--- a/Makefile.am
+++ b/Makefile.am
@@ -6632,7 +6632,7 @@ git-tag:
 
 .PHONY: git-tar
 git-tar:
-       git archive --format=tar --prefix=systemd-$(VERSION)/ HEAD | gzip > systemd-$(VERSION).tar.gz
+       git archive -o systemd-$(VERSION).tar.gz --prefix=systemd-$(VERSION)/ HEAD
 
 www_target = www.freedesktop.org:/srv/www.freedesktop.org/www/software/systemd