Revert "build: explicitly set the linker language for unwind"

This reverts commit 6db7a5cd7c800a588e94ce5c1ef24ae4d60ecdd3.
This adversely impacted the NetBSD libc++ bot for some reason, reverting
while investigating.

GitOrigin-RevId: 049f94af487fc8be704f8740e2d2946ac5c6efc9
1 file changed