Remove unused variables.

src/lib/commands/arm.c

@@ -54,7 +54,7 @@ arm(void)
     struct plnstr pl;
     struct nukstr nuke;
     char *p;
-    int pno, nukno;
+    int nukno;
     struct nstr_item ni;
     char buf[1024];
     char prompt[128];

src/lib/commands/ndump.c

@@ -44,7 +44,6 @@
 int
 ndump(void)
 {
-    int i;
     struct nstr_item nstr;
     struct nukstr nuk;
     time_t now;

src/lib/commands/nuke.c

@@ -48,7 +48,6 @@ nuke(void)
 {
     int first_line = 0;
     int show_comm;
-    int i;
     struct nstr_item nstr;
     struct nukstr nuk;
     struct sctstr sect;

src/lib/commands/strv.c

@@ -57,7 +57,6 @@ static void unit_hdr(void);
 int
 starve(void)
 {
-    struct nstr_sect nstr;
     int do_sects = 0;
     int do_ships = 0;
     int do_units = 0;

src/lib/subs/trdsub.c

@@ -98,14 +98,12 @@ trade_nameof(struct trdstr *tp, union trdgenstr *tgp)
 int
 trade_desc(struct trdstr *tp, union trdgenstr *tgp)
 {
-    int i;
     i_type it;
     struct sctstr sect;
     struct nukstr *np;
     struct shpstr *sp;
     struct plnstr *pp;
     struct lndstr *lp;
-    int needcomma;
     struct nstr_item ni;
     struct plnstr plane;
     struct lndstr land;