Fluidsynth: Drop glib patch when 2.4.7 is released

[Ghabry]

Next fluidsynth version adds an abstraction layer that is either for embedded -Dosal=embedded of for C++11 -Dosal=cpp11 (FluidSynth/fluidsynth#1570).

cpp11 is useful for our desktop/mobile platforms and embedded for homebrew (because thread and mutex implementation is broken).

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Currently embedded lacks big endian support but I'll submit a patch upstream to get this in.

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Required changes shared/patched.sh manually specifiy all the OFF options:

FLUIDSYNTH_ARGS="-DLIB_SUFFIX='' -Denable-alsa=OFF -Denable-aufile=OFF -Denable-dbus=OFF -Denable-ipv6=OFF -Denable-jack=OFF -Denable-ladspa=OFF -Denable-libinstpatch=OFF -Denable-libsndfile=OFF -Denable-midishare=OFF -Denable-network=OFF -Denable-oss=OFF -Denable-dsound=OFF -Denable-wasapi=OFF -Denable-waveout=OFF -Denable-winmidi=OFF -Denable-sdl3=OFF -Denable-pulseaudio=OFF -Denable-pipewire=OFF -Denable-readline=OFF -Denable-threads=OFF -Denable-openmp=OFF -Denable-unicode=OFF"

(Generated via prompt "Here are CMake options, give me a command line that sets all ON options with -DOPTION=OFF to off" + manual check for correctness ;))

2. Add -Dosal=PLATFORM (PLATFORM = embedded or cpp11) depending on the system.

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Edit: patch submitted FluidSynth/fluidsynth#1575