Silence ATK deprecation warnings; remove unneccessary argument processing in at-spi2-atk tests
It's not clear to me yet whether atk-adaptor should be calling deprecated APIs in atk, and anyway not all implementations handle the non-deprecated methods yet. For now, silence those compiler warnings.
Also, remove unnecessary machinery for command-line arguments in the at-spi2-atk tests; gtestutils already does it.
Fixes #60 (closed).