Merge change I45302ff0 into eclair-mr2

* changes:
  make prebuilt .apks require LOCAL_CERTIFICATE
tree: 42d262315537a290eef1da2e214e6d4c90380622
  1. core/
  2. libs/
  3. target/
  4. tools/
  5. buildspec.mk.default
  6. cleanspec.mk
  7. envsetup.sh