meson: debug output on unit test failures

Ensure the testlog.txt file is output to the console if any unit tests
fail. This will help with debug of CI failures in jenkins where only the
console log is available.

Testing: Verified file is output to console on a failure

Change-Id: I4978d676c744c8cd52ff89d316ba7b7fb15674cd
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
1 file changed