audio/mpg123: update to 1.26.1
- Update mpg123 to 1.26.1
- Use https for www.mpg123.de in MASTER_SITES
- Remove INSTALL_TARGET, not needed
- Rework Arch/CPU optimization Enable all optimizations by default for x86, mpg123 uses run-time detection and allow to disable all optimizations if needed
- Enable ability to enable FPU and/or NEON optimization for armv6 and armv7 platforms
- Add support for "make test"
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