(I_NONE, I_CIVIL, I_MILIT, I_SHELL, I_GUN, I_PETROL, I_IRON, I_DUST,

I_BAR, I_FOOD, I_OIL, I_LCM, I_HCM, I_UW, I_RAD, I_MAX): Turn macros
into enumeration constants.
(i_type): New.  Use where appropriate.  No functional changes, except
that I_NONE is now catched properly in a few places.

src/lib/commands/rout.c

@@ -58,7 +58,7 @@ rout(void)
     int row;
     int y;
     int ry;
-    int i_del;
+    i_type i_del;
     int dir;
     s_char *p;
     s_char what[64];