fix B14021 - inconsistent menu styles

Menu styles `partial' and `full' will let you remove any type of
item from the three weapon slots via the 'A' command, but `traditional'
and `combination' would only do that for the primary weapon slot.  For
the alternate weapon and quiver slots, the item in question had to be
one which can normally be wielded or worn, otherwise when choosing the
object class letter you'd be told that it was "Not applicable."  And
for wearable items, you needed to be really wearing one of that class
(besides the quivered one) or else you'd get "not wearing any amulet"
or similar.

include/extern.h

@@ -711,6 +711,7 @@ E char *FDECL(lcase, (char *));
 E char *FDECL(upstart, (char *));
 E char *FDECL(mungspaces, (char *));
 E char *FDECL(eos, (char *));
+E char *FDECL(strkitten, (char *,CHAR_P));
 E char *FDECL(s_suffix, (const char *));
 E char *FDECL(xcrypt, (const char *,char *));
 E boolean FDECL(onlyspace, (const char *));