gpu,op/clip: [compute] get rid of stroke vs fill flags

The fill mode is now controlled by a SetFillMode command, not by flags
on each path segment and fill command.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

gpu/shaders/setup.h

@@ -37,3 +37,12 @@ struct Config {
     Alloc anno_alloc;
     Alloc trans_alloc;
 };
+
+// Fill modes.
+#define MODE_NONZERO 0
+#define MODE_STROKE 1
+
+// fill_mode_from_flags extracts the fill mode from tag flags.
+uint fill_mode_from_flags(uint flags) {
+	return flags & 0x1;
+}