Add better support for loading SDL2 mixer sounds and music from memory #661

Job	Run time
build vcpkg (macos-latest)	3m 28s
build linux pkg-config	1m 56s
build vcpkg (ubuntu-latest)	7m 48s
build vcpkg (windows-latest)	7m 4s
build bundled (macos-latest)	1m 43s
build bundled (ubuntu-latest)	2m 17s
build bundled (--release, ubuntu-latest)	2m 21s
build bundled (--release, macos-latest)	1m 51s
build bundled (windows-latest)	3m 35s
build bundled (static-link, macos-latest)	1m 52s
build bundled (static-link, --release, ubuntu-latest)	2m 21s
build bundled (static-link, ubuntu-latest)	2m 18s
build bundled (static-link, --release, macos-latest)	1m 47s
build bundled (static-link, --release, windows-latest)	4m 25s
build bundled (static-link, windows-latest)	3m 10s
build bundled (--release, windows-latest)	4m 39s
	52m 35s

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