Fix crash when releasing dispatch sources in GSMultiHandle

Source/GSMultiHandle.h

@@ -32,57 +32,6 @@
                              workQueue: (dispatch_queue_t)workQueque;
 - (void) addHandle: (GSEasyHandle*)easyHandle;
 - (void) removeHandle: (GSEasyHandle*)easyHandle;
-- (void) updateTimeoutTimerToValue: (NSInteger)value;
-
-@end
-
-// What read / write ready event to register / unregister.
-typedef NS_ENUM(NSUInteger, GSSocketRegisterActionType) {
-    GSSocketRegisterActionTypeNone = 0,
-    GSSocketRegisterActionTypeRegisterRead,
-    GSSocketRegisterActionTypeRegisterWrite,
-    GSSocketRegisterActionTypeRegisterReadAndWrite,
-    GSSocketRegisterActionTypeUnregister,
-};
-
-@interface GSSocketRegisterAction : NSObject
-{
-  GSSocketRegisterActionType  _type;
-}
-
-- (instancetype) initWithRawValue: (int)rawValue;
-- (GSSocketRegisterActionType) type;
-- (BOOL) needsReadSource;
-- (BOOL) needsWriteSource;
-- (BOOL) needsSource;
-
-@end
-
-/*
- * Read and write libdispatch sources for a specific socket.
- *
- * A simple helper that combines two sources -- both being optional.
- *
- * This info is stored into the socket using `curl_multi_assign()`.
- *
- * - SeeAlso: GSSocketRegisterAction
- */
-@interface GSSocketSources : NSObject
-{
-  dispatch_source_t _readSource;
-  dispatch_source_t _writeSource;
-}
-
-- (void) createSourcesWithAction: (GSSocketRegisterAction *)action
-                          socket: (curl_socket_t)socket
-                           queue: (dispatch_queue_t)queue
-                         handler: (dispatch_block_t)handler;
-- (dispatch_source_t) createSourceWithType: (dispatch_source_type_t)type
-                                    socket: (curl_socket_t)socket
-                                     queue: (dispatch_queue_t)queue
-                                   handler: (dispatch_block_t)handler;
-
-+ (instancetype) from: (void*)socketSourcePtr;
 
 @end