tree af00c96636d726cf70d3342d7ba0f2aafb8b8ab9
parent 733a8c1ce1e31bb4026e73e5246ec1add8996245
author Tom Finegan <tomfinegan@google.com> 1547248002 -0800
committer Tom Finegan <tomfinegan@google.com> 1547508057 +0000

cmake: Always build googletest using internal target.

This avoids collisions in downstream projects that use gtest's
CMake support, or name the gtest target simply "gtest" when those
projects add libaom to their own builds via CMake's
add_subdirectory(). To do this the libaom build now:

- Always builds gtest as its own static library.
- Namespaces the gtest target with the aom_ prefix.
- Adds some logic in test.cmake to handle gtest build flags
  for handling Windows targets and threading.

Change-Id: I33dde59de29d1b6c38c8a62be56a46a657b12dab