Revert "envsetup.sh: support setting arm-eabi toolchain as clang 3.4"

Will be re-implemented properly without the wrapper entirely.
D613 shows off proper target handling alreayd.
This reverts commit 5beabf2ec3cb8e44a288d2e43abc703037e9fa0c.

Change-Id: Ic85724252ed2dc8ab7127b6e5781b799f33a9ed3
Merge branch 'jb-devel-mr2-release' of git://github.com/codefireXperiment/build into jb-devel-mr2-release

Conflicts:
	envsetup.sh

Change-Id: Ib45d0e31d0e0673aab7b028aee501d30d59e14c3