Jump to the future:) system speed increased x3

Author @JustArchi
https://github.com/JustArchi/android_build/commit/8e1b82c082a8de9160e6c0fc3ded37b591c3e517
build: Proper copyright of the optimizations by @JustArchi
Colorize javac errors

You know those multi-line ones that are frequently interspersed with other buld output?
The ones that don't even have the word "error" in them to search for?

This makes them red.

ps2: fix jar_check failures cause by leaving empty stderr files in intermediates dirs
     this is probably not the best place to store stderr before colorizing it if javac
     exits non-zero, but it seems much lighter than mkdiring a bunch of temp directories
     or using sed to mangle the paths to point to per-intermediates directory unique
     temporary file names

Change-Id: I3b9b7d8a0c76958588ac1603b6742987d6dde54c
Signed-off-by: nuclearmistake <nuclearmistake@gmail.com>