am f1c09d7f: Merge "Add HOST_CROSS_OS"

* commit 'f1c09d7fbd92a08cc51950a7d35fb5f7fc564a20':
  Add HOST_CROSS_OS

diff --cc core/binary.mk
Simple merge

diff --cc core/clang/config.mk
Simple merge

diff --cc core/clear_vars.mk
Simple merge

diff --cc core/config.mk
Simple merge

diff --cc core/definitions.mk
Simple merge

diff --cc core/envsetup.mk
Simple merge

diff --cc core/main.mk
Simple merge