[the first commit of this fix was applied to the 32bit-wchar_t-branch instead

of trunk]
Fixed a bug exposed by changes in the locale kit branch:
* the signature of stringbuf::setbuf() wasn't matching the one from streambuf,
  which caused the base version to be hidden instead of overridden - leading
  to crashes during cleanup of stringstream objects

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31262 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/cpp/sstream

@@ -124,7 +124,7 @@ namespace std
     }
 
     virtual streambuf*
-    setbuf(char_type* s, streamsize n)
+    setbuf(char_type* s, int n)
     {
       if (n != 0)
 	{
@@ -226,7 +226,7 @@ namespace std
     char_type*		stream;
     streamsize		stream_len;
   };
-
+
   class istringstream : public istream {
   public:
     typedef char	char_type;
@@ -263,7 +263,7 @@ namespace std
   private:
     stringbuf sb;
   };
-
+
   class ostringstream : public ostream {
   public:
     typedef char	char_type;
@@ -300,7 +300,7 @@ namespace std
   private:
     stringbuf sb;
   };
-
+
   class stringstream : public iostream {
   public:
     typedef char	char_type;