tree 4da19bdcc9b5b6d0689d249657062c9378d307e4
parent 1670d9df4d572bd6836ce2e74ff75cb7fd63cd54
author Evan Lloyd <evan.lloyd@arm.com> 1449082566 +0000
committer Evan Lloyd <evan.lloyd@arm.com> 1459510389 +0100

Make:Use environment variables for OS detection.

Add make helper files to select the appropriate settings for the build
environment. Selection is made in make_helpers/build_env.mk, which
selects other files to include using generic build environment settings.
The Trusted Firmware Makefile and supporting tool Makefiles are updated
to include build_env.mk instead of unix.mk.

NOTE: This change does not fully enable builds in other build
      environments. It facilitates this without compromising the
      existing build environments.

Change-Id: Ic4064ffe6ce158bbd16d7cc9f27dd4655a3580f6