sdl3-sound 3.2.0: Add port

[FtZPetruska]

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SDL_Sound is a lesser-known SDL library from one of its main authors (icculus). It previously released for SDL1.2 and SDL2 but hadn't been packaged on vcpkg.

The only external dependency currently is SDL3, the other optional ones are Doxygen (disabled with SDLSOUND_BUILD_DOCS=OFF) and Perl (SDLSOUND_INSTALL_MAN defaults to OFF) which are only used to build documentation.

Let me know if there is any issue!

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