include: Bury dead remnants of TREATIES and SAIL

Left behind by commit a109de9 and commit dc73207, v4.3.33.

While there, drop a declaration of nonexistent function xedit() that
crept into commit afa65c8, v4.2.20.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>

include/prototypes.h

@@ -226,7 +226,6 @@ int togg(void);
 int torp(void);
 int trad(void);
 int tran(void);
-int trea(void);
 int turn(void);
 int upda(void);
 int upgr(void);
@@ -236,7 +235,6 @@ int wing(void);
 int wipe(void);
 int work(void);
 int xdump(void);
-int xedit(void);
 int zdon(void);
 
 /*
@@ -420,8 +418,6 @@ extern int commdamage(int, int, i_type);
 extern int detonate(struct nukstr *, coord, coord, int);
 /* disloan.c */
 extern int disloan(int, struct lonstr *);
-/* distrea.c */
-extern int distrea(int, struct trtstr *);
 /* fileinit.c */
 extern void ef_init_srv(int);
 extern void ef_fin_srv(void);
@@ -637,8 +633,6 @@ extern void takeover_ship(struct shpstr *, natid);
 extern void takeover_plane(struct plnstr *, natid);
 /* trdsub.c */
 /* in trade.h */
-/* trechk.c */
-extern int trechk(natid, natid, int);
 /* whatitem.c */
 /* in item.h */
 /* wu.c */

include/ship.h

@@ -45,7 +45,6 @@
 #define SHP_TYPE_MAX	46
 #define SHIP_MINEFF	20
 
-#define MAXSHPPATH	28
 #define MAXSHPNAMLEN	24
 
 struct shpstr {

include/types.h

@@ -58,7 +58,6 @@ struct shiplist;
 struct shpstr;
 struct symbol;
 struct trdstr;
-struct trtstr;
 struct comstr;
 struct cmndstr;
 struct ulist;