gitignore: Ignore KDE backup files

KDE editors love to create tons of backup files every time a file is
edited. This makes it very hard to get useful information from git status
and very easy to commit the wrong stuff. Add those to the gitignore list.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Change-Id: I2fbb907f21d85d6994caa8bbe32c4e9814b5f4b4
Reviewed-on: http://review.coreboot.org/1423
Reviewed-by: Peter Stuge <peter@stuge.se>
Tested-by: build bot (Jenkins)
1 file changed