(deli, do_demo, lnd_sweep, guerrilla): Saturate items at ITEM_MAX.

With variables, item increases beyond the capacity of variables
(65535) were ignored here.

This should cover all item changes not going through putvec().

src/lib/commands/deli.c

@@ -101,7 +101,8 @@ deli(void)
 	    if (!check_sect_ok(&sect))
 		continue;
 
-	    del = thresh + dir;
+	    thresh = min(thresh, ITEM_MAX) & ~7;
+	    del = thresh | dir;
 	    sect.sct_del[ich->i_vtype] = del;
 	    putsect(&sect);
 	}

src/lib/commands/demo.c

@@ -105,6 +105,8 @@ do_demo(struct natstr *natp, struct nstr_sect nstr, int number, s_char *p,
 		continue;
 	} else if ((deltamil = min(mil, number)) <= 0)
 	    continue;
+	if (deltamil > ITEM_MAX - civ)
+	    deltamil = ITEM_MAX - civ;
 	civ += deltamil;
 	mil -= deltamil;
 	mil_demob += deltamil;

src/lib/subs/lndsub.c

@@ -715,7 +715,7 @@ lnd_sweep(struct emp_qelem *land_list, int verbose, int takemob,
 		mines--;
 		if (lshells < max)
 		    ++lshells;
-		else
+		else if (sshells < ITEM_MAX)
 		    ++sshells;
 	    }
 	}

src/lib/update/revolt.c

@@ -220,10 +220,9 @@ guerrilla(struct sctstr *sp)
     if ((tnat->nat_stat & STAT_INUSE) == 0) {
 	/* target nation has dissolved: che's retire.  */
 	logerror("%d Che targeted at country %d retiring", che, target);
-	civ += che;
 	sp->sct_che = 0;
 	sp->sct_che_target = 0;
-	sp->sct_item[I_CIVIL] = civ;
+	sp->sct_item[I_CIVIL] = min(civ + che, ITEM_MAX);
 	return;
     }
 
@@ -347,6 +346,10 @@ guerrilla(struct sctstr *sp)
 	    sp->sct_newtype = SCT_AGRI;
 	n = civ / 20;
 	civ -= n;
+	if (civ > ITEM_MAX) {
+	    uw = ITEM_MAX - civ;
+	    civ = ITEM_MAX;
+	}
 	sp->sct_item[I_CIVIL] = civ;
 	sp->sct_item[I_UW] = uw;
 	sp->sct_item[I_MILIT] = n;