Revert "Remove (host) x86_64-linux gcc-4.8 bins"

This reverts commit bb0d30b291585c0ad56611ca85ef1e9156bd28b9.

Reason for revert: looks like the platform is passing the path to these via --gcc-toolchain= then setting -fuse-ld=bfd. I suspect we're not using LLD for the host.

Also, it looks like qemu builds are using x86_64-linux-ar from
here as well.

Bug: 190084016
Bug: 203698882
Change-Id: I5e4eb3bef0d2a82d6b80e33de418344aec65d0d2
34 files changed