Don't use wchar related functions when _GLIBCPP_USE_WCHAR_T isn't defined.

Patch by Bernardo Innocenti <bernie@develer.com>


--- gcc-3.3.1-20030720.orig/libstdc++-v3/include/c_std/std_cstdlib.h	2003-04-18 12:08:05.000000000 +0200
+++ gcc-3.3.1-20030720/libstdc++-v3/include/c_std/std_cstdlib.h	2003-07-26 00:50:26.000000000 +0200
@@ -99,23 +99,26 @@ namespace std 
   using ::free;
   using ::getenv;
   using ::labs;
   using ::ldiv;
   using ::malloc;
-  using ::mblen;
-  using ::mbstowcs;
-  using ::mbtowc;
   using ::qsort;
   using ::rand;
   using ::realloc;
   using ::srand;
   using ::strtod;
   using ::strtol;
   using ::strtoul;
   using ::system;
+
+#ifdef _GLIBCPP_USE_WCHAR_T
+  using ::mblen;
+  using ::mbstowcs;
+  using ::mbtowc;
   using ::wcstombs;
   using ::wctomb;
+#endif // _GLIBCPP_USE_WCHAR_T
 
   inline long 
   abs(long __i) { return labs(__i); }
 
   inline ldiv_t