Mark display in gst_gl_display_egl_from_gl_display as foreign
requested to merge dylanmccall/gst-plugins-base:dylanmccall/fix-egl-terminate-on-existing-display into master
This change prevents GStreamer from calling eglTerminate on an existing EGL display connection. It resolves an issue that I had encountered with GStreamer 1.4 and a patch from gst-plugins-good!134 (merged), which is used in the Endless SDK on ARM.