Auto merge of #132720 - jieyouxu:do-not-strip, r=davidtwco

Only copy, rename and link `llvm-objcopy` if llvm tools are enabled

Fixes #132719.

cc `@bjorn3` who reported the bootstrapping problem for cg_clif.
cc `@davidtwco` in case this might be problematic for linux -> macOS cross-compile builds, but seems very unlikely.
cc `@albertlarsan68` (co-reviewed #131405)

r? bootstrap

Author: bors