buildtools support mingw
Merge branch 'master' into refs/top-bases/t/3rdTools/gtest
Merge commit 'refs/top-bases/t/3rdTools/gtest' into t/3rdTools/gtest
Merge branch 'master' into refs/top-bases/t/3rdTools/gmock
Merge branch 't/3rdTools/gtest' into refs/top-bases/t/3rdTools/gmock
Merge commit 'refs/top-bases/t/3rdTools/gmock' into t/3rdTools/gmock