[FluidSynth] update to 2.2.3

[kcgen]

Library name: fluidsynth

New version number: 2.2.3

Other information that may be useful (release notes, etc...)
https://github.com/FluidSynth/fluidsynth/releases

• FluidSynth previously did not build on macOS 10.5 and earlier
• FluidSynth previously did not build with CMake <3.7
• Applied several audio and soundfont improvements/fixes
• There are no API changes.

[NancyLi1013]

Hi @kcgen

Thanks for posting this issue.

Currently, the upgrade was blocked by the following errors:

CMake Error at C:/Program Files (x86)/CMake/share/cmake-3.21/Modules/ExternalProject.cmake:1738 (file):
  file attempted to create a directory:
  F:/vcpkg_0826/vcpkg/buildtrees/fluidsynth/src/272d57e624-a4c0bbde24/src/gentables
  into a source directory.
Call Stack (most recent call first):
  C:/Program Files (x86)/CMake/share/cmake-3.21/Modules/ExternalProject.cmake:3652 (_ep_set_directories)
  src/CMakeLists.txt:439 (ExternalProject_Add)

I have reported this issue to upstream FluidSynth/fluidsynth#993.

[kcgen]

Thank you, @NancyLi1013 .