blender2.8: New immediate mode for sculpt_uv.c

[Note: this patch functionality was implemented in parallel, independently at bf83f097ad
That said, the original patch was also removing an unnecessary include,
so here it is]

Replaced the one call to `glutil_draw_lined_arc`.
This seems to be the only draw call in this file.

Reviewers: merwin

Tags: #bf_blender_2.8

Maniphest Tasks: T49043

Differential Revision: https://developer.blender.org/D2497

source/blender/editors/sculpt_paint/sculpt_uv.c

@@ -66,7 +66,6 @@
 #include "paint_intern.h"
 #include "uvedit_intern.h"
 
-#include "BIF_gl.h"
 #include "BIF_glutil.h"
 
 #include "UI_view2d.h"