(M_SPY): Unused, remove.

include/ship.h

@@ -163,7 +163,7 @@ struct mchrstr {
 #define M_MINE		bit(7)	/* drop mines */
 #define M_SWEEP		bit(8)	/* clean up the mines */
 #define M_SUB		bit(9)	/* a submarine */
-#define M_SPY		bit(10)	/* gather intelligence info */
+/* unused		bit(10)	*/
 #define M_LAND		bit(11)	/* allows full landing ability */
 #define M_SUBT		bit(12)	/* allows torping of other subs */
 #define M_TRADE		bit(13)	/* is a trade ship */

src/lib/global/nsc.c

@@ -562,7 +562,6 @@ struct symbol ship_chr_flags[] = {
     {M_MINE, "mine"},
     {M_SWEEP, "sweep"},
     {M_SUB, "sub"},
-    {M_SPY, "spy"},
     {M_LAND, "land"},
     {M_SUBT, "sub-torp"},
     {M_TRADE, "trade"},