checkflac needs to be updated from upstream

[Brian Foster]

The current version of checkflac (in 18.10 LTS / Cosmic) is badly out-of-date:

 * It cannot handle filenames with spaces (fairly common for ripped .flac files).
 * It is hardwired to use /dev/hdc as the name of the CD drive.
 * It does not report what the invalid Disc-ID _is_ making it hard to withdraw bogus data from various websites.

ALL of the above problems, and perhaps more, have been fixed upstream,
https://sourceforge.net/projects/flactag/

E.g., "checkflac: make script more resilient for filenames containing spaces or colons",
https://sourceforge.net/p/flactag/git/ci/346d0ad569d7f6bf0a8232975712a42991a5650c/
(which was done back in 2015). There have apparently been about six fixes since the
last release (2.0.4), which is apparently the version in Ubuntu:

346d0ad (HEAD -> master, origin/master, origin/HEAD) checkflac: make script more resilient for filenames containing spaces or colons
827399c discid: exit non-zero on error
cd14b51 Default to /dev/cdrom, allow override
264512e checkflac: exit non-zero on error or mismatch
6e81155 autotools: create uninstall-hook to remove symlinks to man pages
6f6e1eb (tag: 2.0.4) Fil updates in preparation for release