[grits] Cast gluTessCallbacks to void *

[Andy Spencer <andys src gnome org>]

commit 7b3859c2c9eaa74ea34af3d20ed778916f4ebb10
Author: Andy Spencer <andy753421 gmail com>
Date:   Thu Feb 16 21:34:38 2012 +0000

    Cast gluTessCallbacks to void *
    
    Maybe this will work?? unlikely..

 src/objects/grits-poly.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/objects/grits-poly.c b/src/objects/grits-poly.c
index 357afae..0637127 100644
--- a/src/objects/grits-poly.c
+++ b/src/objects/grits-poly.c
@@ -31,9 +31,9 @@ static void grits_poly_tess(gdouble (**points)[3])
 {
 	//g_debug("GritsPoly: tess");
 	GLUtesselator *tess = gluNewTess();
-	gluTessCallback(tess, GLU_TESS_BEGIN,  G_CALLBACK(glBegin));
-	gluTessCallback(tess, GLU_TESS_VERTEX, G_CALLBACK(glVertex3dv));
-	gluTessCallback(tess, GLU_TESS_END,    G_CALLBACK(glEnd));
+	gluTessCallback(tess, GLU_TESS_BEGIN,  (void*)glBegin);
+	gluTessCallback(tess, GLU_TESS_VERTEX, (void*)glVertex3dv);
+	gluTessCallback(tess, GLU_TESS_END,    (void*)glEnd);
 	for (int pi = 0; points[pi]; pi++) {
 		gluTessBeginPolygon(tess, NULL);
 		gluTessBeginContour(tess);