Merge changes I2c10e41f,I5b5e23f1,If3f5a81c,I07520b75

* changes:
  build: remove packages/ from 64-bit blacklist
  build: use TARGET_SUPPORTS_32_BIT_APPS and TARGET_SUPPORTS_64_BIT_APPS
  build: add support for LOCAL_MULTILIB := 64
  build: fix TARGET_PREFER_32_BIT