Revert "lang/rust: fix build with LLVM 22 (PORT_LLVM option)"

This reverts commit 91d047221724449855d84465d8ca53bdddb9fcc2.

This patch was not approved.
This patch interferes with pending rust update (pr 293615)
There was no rush to push this patch since there is a pending rust update (pr 293615)
It breaks lang/rust-nightly