maybe fix mac build

  system/core/libnativebridge/tests/CodeCacheExists_test.cpp:30:15: error:  use of undeclared identifier 'ENOENT'
      ASSERT_EQ(ENOENT, errno);

Change-Id: I188074b878a7ec3955a9f4b5dc7d1bfc56e2ccbc
Merge "maybe fix mac build"