Create ttf-liberation-sans-narrow

In version 2.00.0 and greater, Liberation Sans Narrow was removed. In order to
get the mentioned font, one need to get the previous release. This package will
provide the removed font.

The PKGBUILD is based on the ttf-liberation PKGBUILD in the Arch Linux
repository.
Merge branch 'ttf-liberation-sans-narrow'

Add ttf-liberation-sans-narrow to the maintained packages.