remove error string inline. hopefully helps with odd linking issues

tinyxml2.cpp

@@ -2308,6 +2308,16 @@ void XMLDocument::SetError( XMLError error, const char* str1, const char* str2,
     return errorName;
 }
 
+const char* XMLDocument::GetErrorStr1() const 
+{
+	return _errorStr1.GetStr();
+}
+
+const char* XMLDocument::GetErrorStr2() const 
+{
+	return _errorStr2.GetStr();
+}
+
 const char* XMLDocument::ErrorName() const
 {
     return ErrorIDToName(_errorID);