emulators/mednafen: Update to 1.22.1

-- 1.22.1: --

January 27, 2019:
Changed the default sound device for the OpenBSD sound driver from "/dev/audio" to "/dev/audio0".

January 26, 2019:
Semaphores are now implemented with condition variables and mutexes when compiling against a POSIX threads implementation without sem_timedwait().

January 23, 2019:
PC-FX: Replaced old RAINBOW IDCT code with newly-written code.

January 20, 2019:
Some hotkeys in the debugger's memory editor weren't being ignored properly when in text entry mode; fixed.  (Regression introduced in 1.21.0-UNSTABLE)

January 1, 2019:
Apple2: Corrected minimum allowed value for the "apple2.video.mono_lumafilter" setting(was -2 when it should have been -3).

SS: Corrected line-scroll handling in double-density interlaced mode with non-zero LSS; fixes broken background graphics effect in Dural's stage in "Virtua Fighter 2".

SS: Added "Linkle Liver Story" to the internal database of games to use the data cache read bypass kludge with, to fix a crash/hang when going to the world map.

(nia)