Revert "Makefile: Fix -O3 optimization"

This reverts commit 5b4ce9bfb3f335b4f70681aef50e78f34c1648f2.
Revert "Makefile:  test linaro -o3 optimizations"

This reverts commit 8ea4b4f48ce43e77f312b74d2eedc7cdf366ec8f.