OpenGL threading tests are currently disabled on mac

In qtbase/tests/auto/opengl/qglthreads/tst_qglthreads.cpp, several test functions are disabled for Mac OS with:

#ifdef Q_OS_MAC
    QSKIP("OpenGL threading tests are currently disabled on mac as they were causing reboots");
#endif

As this code was added in February 2010 by a developer who no longer works on Qt and there appears to be no applicable Jira task, I presume that nobody is looking into the problem that caused these tests to be disabled.

Please investigate whether this bug still exists, and if so either correct it or raise a high-priority Jira task (crash bugs get P1 by default). Simply skipping the autotest is not a good enough response to a crash bug – that won't help real users who try to use the misbehaving class in their apps.