Revert "Optimize the CM builds"

This reverts commit 521a5150e87933f26a926037b8e84916a5941d07.
Squisher is gone, we need the signage stuff back
Enable Uighur Language in build.

Change-Id: I7f9430fa65f6477eb4571c09c5dd6589bd63b2ed
envsetup: push to connected device only if it is $CM_BUILD

Change-Id: Icce057cb31d6fbc9abb0292311c88c32fea3540c
envsetup: Don't tread on my $PROMPT_COMMAND

 * I want my own PROMPT_COMMAND to coexist with Android's, so stash it
   in the environment and add it to the new command.

Change-Id: I200902f135d0c5c620a8eb3ce9cefdba318cf9d3