Add better support for loading SDL2 mixer sounds and music from memory #659

Job	Run time
build linux pkg-config	2m 32s
build vcpkg (windows-latest)	8m 57s
build vcpkg (macos-latest)	3m 36s
build vcpkg (ubuntu-latest)	7m 11s
build bundled (macos-latest)	1m 52s
build bundled (--release, ubuntu-latest)	2m 45s
build bundled (--release, macos-latest)	1m 45s
build bundled (--release, windows-latest)	7m 38s
build bundled (static-link, windows-latest)	6m 1s
build bundled (static-link, ubuntu-latest)	2m 14s
build bundled (static-link, --release, macos-latest)	2m 55s
build bundled (windows-latest)	6m 40s
build bundled (ubuntu-latest)	2m 14s
build bundled (static-link, --release, ubuntu-latest)	2m 27s
build bundled (static-link, macos-latest)	3m 7s
build bundled (static-link, --release, windows-latest)	6m 25s
	1h 8m 19s

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