Revert " 4.8 GCC, Strict Aliasing=3, -O3 CFLAG, Opt Flags!!"

This reverts commit 999628d203c2f96400c64794ac7e3fe67d82562b.
build: Add support for PRODUCT_COPY_FILES_OVERRIDES

 * We may have a case where prebuilts need to be built from
   source instead based on an externalized config.
 * New directive takes a list of destination files to remove from
   PRODUCT_COPY_FILES so that other instructions can be supplied.

Change-Id: I7feff16440e54d1676ffddbbd96d5947efa43ede
Merge branch 'kitkat' of github.com:AOSPA-legacy/android_build into kitkat-legacy