Add `libcharset.1.tbd` for Apple targets #538

Job	Run time
linux (x86_64-unknown-linux-musl, x86_64-musl)	1s
linux (i686-unknown-linux-musl, i686-musl)	1s
linux (aarch64-unknown-linux-musl, aarch64-musl)	1s
linux (armv7-unknown-linux-musleabihf, armv7-musleabihf)	1s
linux (armv7-unknown-linux-musleabi, armv7-musleabi)	1s
macos	1s
windows (x64, x86_64-pc-windows-msvc)	2m 18s
windows (x86, i686-pc-windows-msvc)	1s
windows (arm64, aarch64-pc-windows-msvc)	1s
Build Docker Image	0s
Release	1s
	2m 27s

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