Update gcc from 4.7 to 4.8
No 4.4.2_r2 tag for GCC 4.8 so we use master branch
Typo
Update toolchain from GCC 4.7 to 4.8 x2
Update update ART for GCC 4.8
local_manifest: Track our own frameworks/rs
local_manifest: Remove AOSP frameworks/rs
Add also GCC 4.7