ecore-evas: Add missing opengl_drm engine in available engine list

Summary:
This adds opengl_drm to the list of ecore-evas available engines.
Now, we can test opengl_drm engine using expedite.

Test Plan: run expedite with opengl_drm option

Reviewers: devilhorns, stefan_schmidt, cedric, raster

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D1453

src/lib/ecore_evas/ecore_evas_module.c

@@ -261,6 +261,9 @@ _ecore_evas_available_engines_get(void)
                          {
 #ifdef BUILD_ECORE_EVAS_DRM
                             ADDENG("drm");
+#endif
+#ifdef BUILD_ECORE_EVAS_GL_DRM
+                            ADDENG("opengl_drm");
 #endif
                          }
                     }