gitignore: ignore more files

ignore *.patch, *.gcda, *.gcno
Signed-off-by: Nliguang <lig.fnst@cn.fujitsu.com>
Reviewed-by: NAndreas Färber <afaerber@suse.de>
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>

.gitignore

@@ -80,6 +80,9 @@ fsdev/virtfs-proxy-helper.pod
 *.swp
 *.orig
 .pc
+*.patch
+*.gcda
+*.gcno
 patches
 pc-bios/bios-pq/status
 pc-bios/vgabios-pq/status