Remove some unused stuff, mostly Empire 3 leftovers.

src/lib/global/item.c

@@ -59,5 +59,3 @@ struct ichrstr ichr[I_MAX + 2] = {
     {'r', V_RAD, 150, 1, 8, {1, 10, 1, 1}, "radioactive materials"},
     {0, 0, 0, 0, 0, {0, 0, 0, 0}, 0}
 };
-
-int itm_maxno = (sizeof(ichr) / sizeof(struct ichrstr)) - 1;

src/lib/global/news.c

@@ -241,5 +241,3 @@ struct rptstr rpt[N_MAX_VERB + 1] = {
     {-2, N_FRONT, {"mercenaries board one of %s's land units",
 /* 82*/ "elite forces board %s land unit"}}
 };
-
-int nws_maxno = (sizeof(rpt) / sizeof(struct rptstr)) - 1;

src/lib/global/nsc.c

@@ -340,10 +340,3 @@ struct castr nat_ca[] = {
 /* {NSC_LONG | NSC_OFF | fldoff(natstr, nat_flags),"flags",0}, */
     {0, 0, 0}
 };
-
-struct castr map_ca[] = {
-    {NSC_XCOORD | NSC_OFF | fldoff(mapstr, map_x), "x", 0},
-    {NSC_YCOORD | NSC_OFF | fldoff(mapstr, map_y), "y", 0},
-    {NSC_CHAR | NSC_OFF | fldoff(mapstr, map_des), "des", 0},
-    {0, 0, 0}
-};

src/lib/global/treaty.c

@@ -49,5 +49,3 @@ struct tchrstr tchr[] = {
     {TRTENL, "no enlistment"},
     {0, 0}
 };
-
-int trt_maxno = (sizeof(tchr) / sizeof(struct tchrstr)) - 1;