Remove dead debug_clip_tree function

Author: akx

src/libImaging/Draw.c

@@ -1266,31 +1266,6 @@ typedef void (*clip_ellipse_init)(
     clip_ellipse_state *, int32_t, int32_t, int32_t, float, float
 );
 
-void
-debug_clip_tree(clip_node *root, int space) {
-    if (root == NULL) {
-        return;
-    }
-    if (root->type == CT_CLIP) {
-        int t = space;
-        while (t--) {
-            fputc(' ', stderr);
-        }
-        fprintf(stderr, "clip %+fx%+fy%+f > 0\n", root->a, root->b, root->c);
-    } else {
-        debug_clip_tree(root->l, space + 2);
-        int t = space;
-        while (t--) {
-            fputc(' ', stderr);
-        }
-        fprintf(stderr, "%s\n", root->type == CT_AND ? "and" : "or");
-        debug_clip_tree(root->r, space + 2);
-    }
-    if (space == 0) {
-        fputc('\n', stderr);
-    }
-}
-
 // Resulting angles will satisfy 0 <= al < 360, al <= ar <= al + 360
 void
 normalize_angles(float *al, float *ar) {