Thanks to @deadalnix for pointing out the issue.

Follow-up for D3535.

When running make check all the tests output a <test_file>.log file
to the src/test/ directory (in tree).
This diffs moves these logs to the <build_dir>/src/test/ directory
(out of tree) with the name <test_file>.test.log.

mkdir build && cd build
make check

Ensure the test logs are in the correct place.