contrib: update mpg123 to 1.26.0

Build using CMake (faster and already has the proper FPU detection)
Simplify the patches

Set _FILE_OFFSET_BITS as it is set in VLC as the mpg123 change ABI if it's
defined or not...
13 jobs for !14 with mpg123-test in 43 minutes and 6 seconds (queued for 2 seconds)
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android-arm

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snap

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win64-llvm

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