Log Message:
The icon-theme-installer tool makes use of a GNU sed extension, and so
behaves incorrectly on many platforms (E.g. NetBSD)

https://bugs.launchpad.net/geda/+bug/1319785

Fixes build on Linux, corrects icon file names on NetBSD and others.

Bump PKGREVISION.

Discussed with dmcmahill@ - but as we're both right-thinking people that
understand that desktop icons are for pussies, strictly speaking this
has been build-tested and brain-tested only.