don't build with linaro as it doesn't boot

Revert "Fix build with linaro's gcc 4.7"

This reverts commit 2179f0d2f8f26c82f57f2f07362e6c51b9deffda.

Revert "build with linaro toolchain"

This reverts commit e52dae8efad12aed64a04d131e88b82ec3eea327.