egl: Fix Terminate with shared gbm screens

NOTE: This is a candidate for the 7.11 branch.

src/egl/drivers/dri2/egl_dri2.c

@@ -506,6 +506,8 @@ dri2_create_screen(_EGLDisplay *disp)
       return EGL_FALSE;
    }
 
+   dri2_dpy->own_dri_screen = 1;
+
    extensions = dri2_dpy->core->getExtensions(dri2_dpy->dri_screen);
    
    if (dri2_dpy->dri2) {
@@ -576,10 +578,12 @@ dri2_terminate(_EGLDriver *drv, _EGLDisplay *disp)
    _eglReleaseDisplayResources(drv, disp);
    _eglCleanupDisplay(disp);
 
-   dri2_dpy->core->destroyScreen(dri2_dpy->dri_screen);
+   if (dri2_dpy->own_dri_screen)
+      dri2_dpy->core->destroyScreen(dri2_dpy->dri_screen);
    if (dri2_dpy->fd)
       close(dri2_dpy->fd);
-   dlclose(dri2_dpy->driver);
+   if (dri2_dpy->driver)
+      dlclose(dri2_dpy->driver);
 
    if (disp->PlatformDisplay == NULL) {
       switch (disp->Platform) {

src/egl/drivers/dri2/egl_dri2.h

@@ -71,6 +71,7 @@ struct dri2_egl_display
    int                       dri2_major;
    int                       dri2_minor;
    __DRIscreen              *dri_screen;
+   int                       own_dri_screen;
    const __DRIconfig       **driver_configs;
    void                     *driver;
    __DRIcoreExtension       *core;

src/gallium/state_trackers/egl/drm/native_drm.c

@@ -127,6 +127,8 @@ drm_display_destroy(struct native_display *ndpy)
 
    drm_display_fini_modeset(&drmdpy->base);
 
+   /* gbm owns screen */
+   ndpy->screen = NULL;
    ndpy_uninit(ndpy);
 
    if (drmdpy->device_name)