Revert "Makefile: fixes for GCC 4.9.1 Linaro compatibility"

This reverts commit eb5cd91b2d978b21743d1b73d5ce2d60de6e64a2.
Revert "Makefile: changes and Cortex-A15 optimizations for GCC 4.8.3 Linaro"

This reverts commit b5755dd02532bb010480bb50e5eb6cbb4dfaa8dc.