patch 9.0.0265: no good reason why the "gf" command isn't in the tiny version

Problem:    No good reason why the "gf" command is not in the tiny version.
Solution:   Graduate the file_in_path feature.

src/filepath.c

@@ -942,7 +942,6 @@ findfilendir(
     typval_T	*rettv,
     int		find_what UNUSED)
 {
-#ifdef FEAT_SEARCHPATH
     char_u	*fname;
     char_u	*fresult = NULL;
     char_u	*path = *curbuf->b_p_path == NUL ? p_path : curbuf->b_p_path;
@@ -951,7 +950,6 @@ findfilendir(
     int		count = 1;
     int		first = TRUE;
     int		error = FALSE;
-#endif
 
     rettv->vval.v_string = NULL;
     rettv->v_type = VAR_STRING;
@@ -962,7 +960,6 @@ findfilendir(
 		    && check_for_opt_number_arg(argvars, 2) == FAIL)))
 	return;
 
-#ifdef FEAT_SEARCHPATH
     fname = tv_get_string(&argvars[0]);
 
     if (argvars[1].v_type != VAR_UNKNOWN)
@@ -1006,7 +1003,6 @@ findfilendir(
 
     if (rettv->v_type == VAR_STRING)
 	rettv->vval.v_string = fresult;
-#endif
 }
 
 /*
@@ -3879,9 +3875,7 @@ gen_expand_wildcards(
     static int		recursive = FALSE;
     int			add_pat;
     int			retval = OK;
-#if defined(FEAT_SEARCHPATH)
     int			did_expand_in_path = FALSE;
-#endif
 
     /*
      * expand_env() is called to expand things like "~user".  If this fails,
@@ -3971,7 +3965,6 @@ gen_expand_wildcards(
 	     */
 	    if (mch_has_exp_wildcard(p) || (flags & EW_ICASE))
 	    {
-#if defined(FEAT_SEARCHPATH)
 		if ((flags & EW_PATH)
 			&& !mch_isFullName(p)
 			&& !(p[0] == '.'
@@ -3987,7 +3980,6 @@ gen_expand_wildcards(
 		    did_expand_in_path = TRUE;
 		}
 		else
-#endif
 		    add_pat = mch_expandpath(&ga, p, flags);
 	    }
 	}
@@ -4007,10 +3999,8 @@ gen_expand_wildcards(
 		vim_free(t);
 	}
 
-#if defined(FEAT_SEARCHPATH)
 	if (did_expand_in_path && ga.ga_len > 0 && (flags & EW_PATH))
 	    uniquefy_paths(&ga, p);
-#endif
 	if (p != pat[i])
 	    vim_free(p);
     }