testglxqueryversion will now call XQueryExtension to check whether the server supports the GLX extension. If it doesn't, then it will skip the test instead of reporting it as a failure. https://github.com/NVIDIA/libglvnd/issues/93
testglxqueryversion.c: In function 'main': testglxqueryversion.c:39:17: warning: unused variable 'str' [-Wunused-variable] Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
This verifies that the GLX API library's hand-coded implementation of glXQueryVersion() works as expected.