portage: add make.defaults file for setting up USE

There's a bunch of settings we want to disable, so set up a make.defaults
file to hold all of those in our custom profile.

TEST=emerging packages no longer enables a lot of USE flags

Change-Id: I0b4987e050ecf3aa20da545f7d70ed120c1b8ec4
2 files changed
tree: 7f3ce3bb86ba7e9fdb58de8b5ce366137bde8ab7
  1. 3rd-party-binary.mk
  2. Android.mk
  3. TODO
  4. portage/
  5. tests/
  6. toolchain/