[AdgPath] Removed adg_path_dup_cpml_path()

[AdgPath] Removed adg_path_dup_cpml_path()

A similar result could be obtained by using the new
adg_segment_deep_dup() API on the unobtrusive segment got from
the cpml path, for instance:

AdgSegment segment_org;
AdgSegment *segment;

cpml_segment_from_cairo(&segment_org, adg_path_get_cpml_path(path));
segment = adg_segment_deep_dup(&segment_org);
/* Process the new segment without modifying the original path */
g_free(segment);