add brew linkapps --system

Added an option to linkapps to allow linking to /Applications rather
than ~/Applications

Closes #18196.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
flactag 2.0.4

Add flactag, a MusicBrainz-enabled FLAC tagging program

It's a console-based tagging app for FLAC rips of entire CDs (with
embedded cuesheets) that seems fairly popular among the DAE folks.

Closes #18107.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>