Add build variables to make host build more convenient

bug: 115618941

- Avoid clobbering EMUGL_PATH
- Set the right build variables if GOLDFISH_OPENGL_HOST_BUILD is set

As we get more of it building, move the "TODO" line down more
in the top-level Android.mk

Change-Id: I02e7cc3f82fd8561f8c3ef847fcf08b657334995
7 files changed
tree: 8503dea47f748219889b22265af4399f7ce9102f
  1. host/
  2. shared/
  3. system/
  4. tests/
  5. Android.mk
  6. common.mk
  7. README