[libc-commits] [libc] [libc][startup] set --target= for linker when cross compiling (PR #96342)

[Nick Desaulniers via libc-commits]

nickdesaulniers wrote:

ah, the GCC build is failing for the host build. We don't set `explicit_target_triple` at all when targeting the host. Can fix forward that.

https://github.com/llvm/llvm-project/pull/96342