Log Message:
mpg123: updated to 1.26.4

1.26.4
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- Clarify seeking documentation regarding samples and PCM frames.
- Fix build on MorphOS (patch by Ozkan Sezer, bug 295).
- Fix cmake build to install fmt123.h.
- Some cmake build fixes, tinyalsa addition by Maarten (bug 299).
- libmpg123: explicitly handle some