Comment 2 for bug 1631434

StacktraceTop:
 _cogl_check_extension (name=0x561aa96a3110 "GLX_EXT_texture_from_pixmap", ext=ext@entry=0x0) at cogl.c:75
 _cogl_feature_check (renderer=renderer@entry=0x561aa96c9470, driver_prefix=driver_prefix@entry=0x7fab23a4ec1b "GLX", data=data@entry=0x7fab23c70d18 <winsys_feature_data+56>, gl_major=<optimized out>, gl_minor=<optimized out>, driver=driver@entry=COGL_DRIVER_GL, extensions=0x0, function_table=0x561aa97c2000) at cogl-feature-private.c:128
 update_base_winsys_features (renderer=0x561aa96c9470) at winsys/cogl-winsys-glx.c:692
 _cogl_winsys_renderer_connect (renderer=0x561aa96c9470, error=<optimized out>) at winsys/cogl-winsys-glx.c:794
 cogl_renderer_connect (renderer=0x561aa96c9470, error=0x7ffe8351c420) at cogl-renderer.c:687