build

rust/language.rs: add full BCP 47 compliant pipeline #13769

Job	Run time
win32 (x86_64-pc-windows-msvc, x64, windows-latest)	15m 16s
win32 (aarch64-pc-windows-msvc, arm64, windows-11-arm)	21m 7s
linux (gcc, g++, -Db_ndebug=true)	2m 46s
mingw (i686, wine32)	6m 6s
linux (clang, clang++, lld, -Db_lto=true -Db_lto_mode=thin)	3m 42s
mingw (x86_64, wine64)	6m 31s
macos (clang, clang++, macos-13)	12m 24s
macos (clang, clang++, macos-14)	7m 11s
macos (clang, clang++, macos-15)	6m 50s
linux-ffmpeg-6-1	1m 28s
linux-fuzz	2m 19s
freebsd	3m 48s
openbsd	15m 32s
msys2 (mingw64, windows-latest)	6m 12s
msys2 (clang64, windows-latest)	5m 26s
msys2 (ucrt64, windows-latest)	5m 52s
msys2 (clangarm64, windows-11-arm)	5m 40s
	2h 8m 10s

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