Revert "add rtl::OUStringBuffer::append(bool)"

This reverts commit 563fa900.

sal/inc/rtl/ustrbuf.hxx

@@ -500,25 +500,6 @@ public:
         return *this;
     }
 
-    /**
-        Appends the string representation of the <code>bool</code>
-        argument to the string buffer.
-
-        The argument is converted to a string as if by the method
-        <code>String.valueOf</code>, and the characters of that
-        string are then appended to this string buffer.
-
-        @param   b   a <code>bool</code>.
-        @return  this string buffer.
-
-        @since LibreOffice 3.7
-     */
-    OUStringBuffer & append(bool b)
-    {
-        sal_Unicode sz[RTL_USTR_MAX_VALUEOFBOOLEAN];
-        return append( sz, rtl_ustr_valueOfBoolean( sz, b ) );
-    }
-
     /**
         Appends the string representation of the <code>sal_Bool</code>
         argument to the string buffer.