Change default flags.

Credit to codefirex
Revert "Build fix"

This reverts commit 3d80cf76e52bb95f18685a89ef039ba6cae339e5.
Revert "build: Relax Cortex CFLAGS"

This reverts commit 9fc0f150cd953ca8209e92bf54e936e5e436c1fe.
Revert "build: move bionic optimizations to NEON makefile"

This reverts commit c480714af42c4470b1c1414151d99a2bc436162a.
Revert "build: Enable Bionic optimizations on Cortex platforms"

This reverts commit e43445df871bb45f5424aa476ad117d70e631b4c.