Adds a `--disable-opus-cdda` flag that explicitly disables support
for Ogg Opus CDDA tracks and in turn avoid the need for the Opus package
dependencies such as the opusfile, opus, and ogg libraries.
This feature does not alter the default operation of ./configure, which
is to enable Opus CDDA support and quit if the Opus dependency package,
opusfile, is not found. The user can then choose to either a) install
the package or b) explicitly disable Opus support.
This commit also includes:
- fixes for a double-free in the MP3 close routine that
was discovered during testing
- a message if a CD audio track cannot be added during CDROM
mounting (such as attempting to use Opus tracks when the binary
does not support them).
- the --disable-opus-cdda flag in our config heavy workflow
f6060a5148