Eliminate needless QSKIPs in qaccessibility test.

Eliminate needless QSKIPs in qaccessibility test.

On Unix the table1 interface was replaced by the table2 interface, while
table1 is still used on other platforms.  This commit changes the test
so that only the applicable test functions are built and run, where
previously both sets of tests were built and one set would always skip.

Change-Id: I5a785fb88fcbf4e5896e1fdb80c7c0a659597e34
Reviewed-on: http://codereview.qt-project.org/6097
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>