(sct_pstage, sct_ptime, shp_pstage, shp_ptime, lnd_pstage, lnd_ptime):

Use `short' instead of `unsigned short'.  With variables, plague stage
and time were stored unsigned and used signed, which worked.  Removal
of variables dropped the conversion to signed, which broke
plague_people() (plague.c rev. 1.6): stage didn't progress correctly
due to catastrophic underflow of time.

src/lib/update/land.c

@@ -115,7 +115,7 @@ upd_land(struct lndstr *lp, int etus,
 	       /* build = 1, maintain = 0 */
 {
     struct lchrstr *lcp;
-    u_short pstage, ptime;
+    int pstage, ptime;
     int n;
     int min = morale_base - (int)np->nat_level[NAT_HLEV];
     int mult;