https://bugs.gentoo.org/936501

This function does not compile with gcc-15, but it was never instantiated, so just remove it.

--- a/src/xalanc/XMLSupport/XalanOtherEncodingWriter.hpp
+++ b/src/xalanc/XMLSupport/XalanOtherEncodingWriter.hpp
@@ -301,44 +301,6 @@ public:
         return write(chars, start, length, m_charRefFunctor);
     }
 
-    void
-    writeSafe(
-            const XalanDOMChar*     theChars,
-            size_type               theLength)
-    {
-        for(size_type i = 0; i < theLength; ++i)
-        {
-            const XalanDOMChar  ch = theChars[i];
-
-            if (isUTF16HighSurrogate(ch) == true)
-            {
-                if (i + 1 >= theLength)
-                {
-                    throwInvalidUTF16SurrogateException(ch, 0,  getMemoryManager());
-                }
-                else 
-                {
-                    XalanUnicodeChar    value = decodeUTF16SurrogatePair(ch, theChars[i+1],  getMemoryManager());
-
-                    if (this->m_isPresentable(value))
-                    {
-                        write(value);
-                    }
-                    else
-                    {
-                        this->writeNumberedEntityReference(value);
-                    }
-
-                    ++i;
-                }
-            }
-            else
-            {
-                write(static_cast<XalanUnicodeChar>(ch));
-            }
-        }
-    }
-
     void
     write(const XalanDOMChar*     theChars)
     {