am 2ff8919d: Merge changes I7e809264,I504cea21,Ibd2165e6

* commit '2ff8919de339209412d9da2a524f566dfcf5847f':
  build: add core_64_bit.mk
  build: reverse abi list when TARGET_PREFER_32_BIT_APPS is set
  build: split TARGET_PREFER_32_BIT for apps and executables