Fix T59237: Instancing on a path doesn't do anything

This commit makes it so curve path parent solving accepts an explicit
arguments for both time and curve speed flag, making it so we don't
have to mock around with scene's frame.

One unfortunate issue still is that if the instancing object is used
for something else, we might be running into a threading conflict.
Possible solution would be to create a temp copy of an object, but
then it will be an issue of preventing drivers from modifying other
datablocks.

At least the original issue is fixed now, and things behave same as
in older Blender version. Additionally, the global variable which
was defining curve speed flag behavior is gone now!

source/blender/blenkernel/BKE_tracking.h

@@ -63,7 +63,7 @@ struct MovieTrackingReconstruction *BKE_tracking_get_active_reconstruction(struc
 
 /* matrices for constraints and drawing */
 void BKE_tracking_get_camera_object_matrix(
-        struct Depsgraph *depsgraph, struct Scene *scene, struct Object *ob, float mat[4][4]);
+        struct Scene *scene, struct Object *ob, float mat[4][4]);
 void BKE_tracking_get_projection_matrix(struct MovieTracking *tracking, struct MovieTrackingObject *object,
                                         int framenr, int winx, int winy, float mat[4][4]);