Ok, so I did the same with distro fsl-x11 distro (same local.conf as above, only changed distro) and issue prevails.
though imxeglvivsink is tot there anymore, but I tried with glimagesink and caught exactly the same segfault:

> 
> root@imx6qdlsabresd:~# DISPLAY=:0 gst-launch-1.0 videotestsrc !
> glimagesink
> Setting pipeline to PAUSED ...
> Xlib:  extension "XFree86-DRI" missing on display ":0".
> Xlib:  extension "XFree86-DRI" missing on display ":0".
> Xlib:  extension "XFree86-DRI" missing on display ":0".
> Pipeline is PREROLLING ...
> Got context from element 'sink': gst.gl.GLDisplay=context,
> gst.gl.GLDisplay=(GstGLDisplay)"\(GstGLDisplayX11\)\ gldisplayx11-0";
> Caught SIGSEGV
> exec gdb failed: No such file or directory
> Spinning.  Please run 'gdb gst-launch-1.0 589' to continue debugging,
> Ctrl-C to quit, or Ctrl-\ to dump core.
> 
>