Remove some unused junk.

src/lib/subs/aircombat.c

@@ -54,9 +54,6 @@
 #include "server.h"
 
 
-#ifndef MIN
-#define MIN(x,y) ((x) < (y) ? (x) : (y))
-#endif
 #ifndef MAX
 #define MAX(x,y) ((x) < (y) ? (y) : (x))
 #endif
@@ -66,7 +63,6 @@ static void getilist(struct emp_qelem *list, natid own,
 		     struct emp_qelem *c, struct emp_qelem *d);
 static void ac_dog(register struct plist *ap, register struct plist *dp);
 
-#define DOG_MAX         15
 #define FLAK_MAX        15
 
 		/*       -7    -6    -5    -4    -3    -2    -1    0 */

src/lib/subs/fortdef.c

@@ -50,7 +50,6 @@
 #include "optlist.h"
 #include "prototypes.h"
 
-#define	QUIET	0
 #define	NOISY	1
 
 /*

src/lib/subs/retreat.c

@@ -436,7 +436,6 @@ retreat_land1(struct lndstr *lp, s_char code, int orig)
     double mobcost;
     struct lchrstr *lcp;
     int time_to_stop;
-    s_char buf[RET_LEN - 1];
 
     lp->lnd_mission = 0;
     if (lp->lnd_own == 0)

src/lib/subs/show.c

@@ -142,7 +142,6 @@ struct look_list {
 	struct lchrstr *lp;
 	struct plchrstr *pp;
 	struct mchrstr *mp;
-	int value;
     } l_u;
     int tech;
 } lookup_list[200];		/* Change this if there are ever more than 200 planes, ships