Revert "Makefile: change to 4.7 toolchain from googlesource."

This reverts commit bbcfe18bc9e939f5f617ff76cb45c30783119230.
Revert "Makefile: add arch, toolchain path and remove the stupid REAL_CC link."

This reverts commit 1813843ff375bac90afcfd3cec262306d73862b6.