switch to linaro gcc 4.7 toolchain
fix for gcc 4.7 toolchain
Revert "fix for gcc 4.7 toolchain"

This reverts commit 60dca7c5f46c453dbe933278eb802c84d5a58b01.
Revert "switch to linaro gcc 4.7 toolchain"

This reverts commit d5416d4519cf28ac48578c0adff722c594302c29.