emulators/wine-devel: Account for bundled mpg123 library

Since version 6.20 Wine bundles and unconditionally uses its own copy of
the mpg123 library.

Accordingly remove the MPG123 option and associated logic, unconditionally
package associated files (Mk/Scripts/check-stagedir.sh missed those [1]),
and bump PORTREVISION.

PR: 220950 [1]