build: various changes to release.sh

- do not remove autogen.sh
- remove COMMIT_NOTES - it does not apply to git anymore
- create SHA1 sums for tarballs and patches

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
diff --git a/release.sh b/release.sh
index f77ef25..526fb95 100644
--- a/release.sh
+++ b/release.sh
@@ -18,13 +18,14 @@
 
 cd "$IPTDIR" && {
 	sh autogen.sh
-	rm autogen.sh COMMIT_NOTES
 	cd ..
 }
 
 tar -cjf "$TARBALL" "iptables-$VERSION";
 gpg -u "Netfilter Core Team" -sb "$TARBALL";
 md5sum "$TARBALL" >"$TARBALL.md5sum";
+sha1sum "$TARBALL" >"$TARBALL.sha1sum";
 
 gpg -u "Netfilter Core Team" -sb "$PATCH";
 md5sum "$PATCH" >"$PATCH.md5sum";
+sha1sum "$PATCH" >"$PATCH.sha1sum";