Move HAVE_WCSXXX from wx/osx/config_xcode.h to wx/osx/chkconf.h.

The latter file is also used when building from the command line while the
former is only used in Xcode build, as its name indicates (which didn't help
me to notice it, however).

Also restore the test for wcsftime() in configure as it is available even on
older systems but do not test for strnlen() -- as it is not.

These changes amend those of r74523.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@74534 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

configure

@@ -29906,12 +29906,12 @@ if test "$WCSLEN_FOUND" = 1; then
 
 fi
 
-for ac_func in strnlen
+for ac_func in wcsftime
 do :
-  ac_fn_c_check_func "$LINENO" "strnlen" "ac_cv_func_strnlen"
-if test "x$ac_cv_func_strnlen" = xyes; then :
+  ac_fn_c_check_func "$LINENO" "wcsftime" "ac_cv_func_wcsftime"
+if test "x$ac_cv_func_wcsftime" = xyes; then :
   cat >>confdefs.h <<_ACEOF
-#define HAVE_STRNLEN 1
+#define HAVE_WCSFTIME 1
 _ACEOF
 
 fi
@@ -29919,7 +29919,7 @@ done
 
 
 if test "$wxUSE_MAC" != 1; then
-    for ac_func in wcsdup wcsftime wcsnlen wcscasecmp wcsncasecmp
+    for ac_func in strnlen wcsdup wcsnlen wcscasecmp wcsncasecmp
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
 ac_fn_c_check_func "$LINENO" "$ac_func" "$as_ac_var"