core: main: remove all the spam about including make files

Change-Id: Ifd2ef0e239d16b169c572472416c2c31df62a367
envsetup: do not print an error if complete fails

complete is a bashism; so it will fail on other shells. Avoid printing
an error if that is the case.

Change-Id: Id6d6311792f409cc3a697c7a2bb003863f1afe60
envsetup: drop unnecesary exports

export -f is a bashism and we don't actually need it, so lets remove it.

Change-Id: I9228cef0c4a9543b3d34fdc39a368ad0238431e2
envsetup: Mark zsh as compatible

Basic functionality has been tested on zsh 5.0.2 and has been found to
work correctly.

Change-Id: I02e5e3bedf56b43104c280d9737ae7b334357643
Support building with GNU make 4.0

* It works just fine, no need for the warning.

Change-Id: Ifa2ab17454edfcd8b7840a7534f70576286f2864
Add support for instruction set features

This adds the --instruction-set-features= arguments to the dex2oat
commands for the system images.  The feature set is determined at
build time

(cherry picked from commit 4145a2a20a0f275fe4c77e39d507cd5f8eb7a73b)

(cherry picked from commit 5174bb052986e9d90b597824a7e7b9ee2dfc8668)

Change-Id: I45af3b59752a48897bff2dd468b74f3ea73000be