gitignore: ignore vim swapfiles and patches

The .*.swp files are created by vim to hold the undo/redo log. Add them to
.gitignore to prevent "git status" or "git gui" from showing them whenever
some file is open in editor.

Add also *.patch to hide patches created by e.g. "git format-patch".

Signed-off-by: Michal Kubecek <mkubecek@suse.cz>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
1 file changed