GCC 4.9: move binary names and add 3s sleeps

As per:
https://android.googlesource.com/platform/prebuilts/clang/host/linux-x86/+/master/GCC_4_9_DEPRECATION.md

Also fixes a missed renamed from aosp/948236. No one reported any build
failures which implies that nothing is invoking
arm-linux-androideabi-gcc on Darwin and reporting such failues.  That
sounds like one less thing that will break when removed.

Change-Id: Ib8c67bb1d7bb88d977dca03a4b40b2e4f867fea1
4 files changed