[libmt32emu] update from 2.5.0 to 2.5.3

[kcgen]

Library name: libmt32emu

New version number: 2.5.3 (tag)

Other information:

• release notes

  2.5.3 released 2021-08-07:

  • Fixed possible access to uninitialised rhythm timbre memory when using MT-32 control ROM.
    With control ROMs 2.04 and above, the entire rhythm timbre memory is now initialised
    as the real devices do. Those timbres that do not exist in MT-32 models are now muted.
    With control ROMs 1.xx, the timbres 30..59 are mapped to 0..29 that should correspond
    to the behaviour of real units. The other 4 timbres are muted to avoid undefined behaviour
    the real hardware exhibits. (Find a testing solution #72)

  2.5.2 released 2021-07-18:.

  • Fixed compilation of client programs written in C when the automatic runtime version check
    is enabled with the preprocessor macro MT32EMU_RUNTIME_VERSION_CHECK 2. This may be needed
    on systems where symbol versioning is unavailable. (Add SFML 2.4.0 #71)
  • Tweaked AUTHORS.txt to contain the entire license of embedded third-party code.

  2.5.1 released 2021-05-22:

  • Fixed incorrect delete statement in ROMImage dtor, affects memory deallocations
    of full ROMImages created by merging partial ones. (Error updating boost #60)

Thank you, vcpkg team!

[kcgen]

libmt32emu 2.5.3 has been tested and confirmed working with DOSBox Staging.