Remove comments that no longer apply. clocale should not do anyting if CONFIG_LIBC_LOCALE is not defined.

include/cxx/clocale

@@ -46,9 +46,11 @@
 // Namespace
 //***************************************************************************
 
+#ifdef CONFIG_LIBC_LOCALE
 namespace std
 {
   using ::setlocale;
 }
+#endif
 
 #endif // __INCLUDE_CXX_CLOCALE

include/locale.h

@@ -40,6 +40,7 @@
  * Included Files
  ****************************************************************************/
 
+#include <nuttx/config.h>
 #include <nuttx/compiler.h>
 
 #ifdef CONFIG_LIBC_LOCALE

include/stddef.h

@@ -80,7 +80,7 @@
  *   codes for all members of the largest character set specified among the
  *   locales supported by the compilation environment: the null character has
  *   the code value 0 and each member of the portable character set has a
- *   code value equal to its value when used as the lone character in an\
+ *   code value equal to its value when used as the lone character in an
  *   integer character constant.
  *
  * size_t

include/wchar.h

@@ -102,6 +102,8 @@ typedef int wint_t;
  *   A scalar type of a data object that can hold values which represent
  *   locale-specific character classification.
  *
+ *   Ddefined in wctype.h.  Should be defined here.
+ *
  * mbstate_t
  *   An object type other than an array type that can hold the conversion
  *   state information necessary to convert between sequences of (possibly
@@ -110,21 +112,6 @@ typedef int wint_t;
  *   state, the results are unspecified.
  */
 
-/* Commented out because this is dangerous.  This defines a type that would
- * be internal to some wchar implementation.  NuttX does not implement the
- * wchar functions.  Having this definition is a time bomb:  If this header
- * file is inadvertently included in code that interacts with an external
- * library and if the definition of mbstate_t does not EXACTLY match the
- * usage in that external library, then a potentially fatal error could
- * occur.
- *
- * It is better to let the build error out due to the lack of the mbstate_t
- * definition.  At least that way, the problem can be avoided and the user
- * can come up with some alternative way of dealing with the interfacing
- * issue that does not require NuttX to be in lock-step with some external
- * implementation.
- */
-
 struct mbstate_s
 {
   int __fill[6];