Reduce yellow brick road tiles to XPM palette.

ChangeLog.rtro

@@ -1,6 +1,9 @@
 ------------------------
 Changes for top of trunk
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+2021-09-04 Daniel Hawkins
+	* road/yellow/yellow_*.rtro.111.png: Reduce to XPM palette.
+
 2021-09-02 Daniel Hawkins
 	* weapon/hammer/hammer_2.rtro.1*.png: Borrow hammer faces from 0.93.4 instead of earlier versions
 	      to get the directional throwing faces by default.