Bug 1715245 - Leave X11 connection open, r=aosmond

Closing the X11 connection is buggy on nv prop. drivers. Leave
it open, the process will exit anyways.

Differential Revision: https://phabricator.services.mozilla.com/D117325

toolkit/xre/glxtest.cpp

@@ -849,7 +849,10 @@ static bool x11_egltest(int pci_count) {
 
   get_x11_screen_info(dpy);
 
-  XCloseDisplay(dpy);
+  // Bug 1715245: Closing the display connection here crashes on NV prop.
+  // drivers. Just leave it open, the process will exit shortly after anyway.
+  // XCloseDisplay(dpy);
+
   record_value("TEST_TYPE\nEGL\n");
   return true;
 }