Revert "build: add LINARO_BUILD to use gcc 4.7"

This reverts commit bd4477e0b0d505abab5ca9b95bb74541d40c6e26.

this doesnt work anymore and was never used

Change-Id: I57db225d692428b750baa7209c2628d4797b69d4
Merge "Revert "build: add LINARO_BUILD to use gcc 4.7"" into jellybean