[Tinymux] make problems

[Stephen Dennis]

Remove two lines in externs.h. This was fixed in TinyMUX 2.3 in
August, but not released, yet.

 extern char *next_token(char *str, char sep);
 extern char *split_token(char **sp, char sep);

-#ifdef HAVE_IEEE_FP_FORMAT
 #define IEEE_MAKE_NAN  1
 #define IEEE_MAKE_IND  2
 #define IEEE_MAKE_PINF 3
 #define IEEE_MAKE_NINF 4

 double MakeSpecialFloat(int iWhich);
-#endif // HAVE_IEEE_FP_FORMAT

 /* From unparse.cpp */
 extern char *unparse_boolexp(dbref, BOOLEXP *);