Remove some superflous declarations missed in the previous revision.

src/lib/commands/ldump.c

@@ -53,7 +53,6 @@ ldump(void)
     struct nstr_item ni;
     struct lndstr land;
     int vec[I_MAX + 1];
-    s_char *mission_short_name(int);
     int n, i;
     struct natstr *np;
     time_t now;

src/lib/commands/lstat.c

@@ -50,7 +50,6 @@ lsta(void)
     int nunits;
     struct nstr_item ni;
     struct lndstr land;
-    s_char *mission_short_name(int);
 
     if (!snxtitem(&ni, EF_LAND, player->argp[1]))
 	return RET_SYN;

src/lib/commands/thre.c

@@ -49,7 +49,6 @@
 int
 thre(void)
 {
-    extern struct ichrstr *whatitem(s_char *, s_char *);
     struct sctstr sect;
     struct nstr_sect nstr;
     int val;