compiler: Set libc++ ABI version to 2 for Emscripten.
It remains 1 everywhere else.
Also remove some code that allowed setting the libc++ ABI version on the
Compilation since there are no current plans to actually expose this in the CLI.
566e4ab6b1Alex Rønne Petersen committed on 5/5/2025, 5:25:25 AMparent7b45bd3