[package] update rtorrent to 0.8.4-svn1087 (#4851)

git-svn-id: svn://svn.openwrt.org/openwrt/packages@15090 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/rtorrent/patches/800-fix-xmlrpc-utf8.diff

@@ -0,0 +1,42 @@
+# Fix crashes/errors due to rtorrent attempting to pass non-utf-8 strings to xmlrpc.
+# by jdrexler
+Index: rtorrent/src/rpc/xmlrpc.cc
+===================================================================
+--- rtorrent/src/rpc/xmlrpc.cc	(revision 1078)
++++ rtorrent/src/rpc/xmlrpc.cc	(working copy)
+@@ -371,8 +371,34 @@
+ #endif
+ 
+   case torrent::Object::TYPE_STRING:
+-    return xmlrpc_string_new(env, object.as_string().c_str());
++  {
++#ifdef XMLRPC_HAVE_I8
++    // The versions that support I8 do implicit utf-8 validation.
++    xmlrpc_value* result = xmlrpc_string_new(env, object.as_string().c_str());
++#else
++    // In older versions, xmlrpc-c doesn't validate the utf-8 encoding itself.
++    xmlrpc_validate_utf8(env, object.as_string().c_str(), object.as_string().length());
+ 
++    xmlrpc_value* result = env->fault_occurred ? NULL : xmlrpc_string_new(env, object.as_string().c_str());
++#endif
++
++    if (env->fault_occurred) {
++      xmlrpc_env_clean(env);
++      xmlrpc_env_init(env);
++
++      const std::string& str = object.as_string();
++      char buffer[str.size() + 1];
++      char* dst = buffer;
++      for (std::string::const_iterator itr = str.begin(); itr != str.end(); ++itr)
++        *dst++ = ((*itr < 0x20 && *itr != '\r' && *itr != '\n' && *itr != '\t') || (*itr & 0x80)) ? '?' : *itr;
++      *dst = 0;
++
++      result = xmlrpc_string_new(env, buffer);
++    }
++
++    return result;
++  }
++
+   case torrent::Object::TYPE_LIST:
+   {
+     xmlrpc_value* result = xmlrpc_array_new(env);