Delete yield_end function since yield was removed upstream

capnp/async.pyx

@@ -42,9 +42,6 @@ cdef class EventLoop:
         Py_INCREF(error_func)
         return Promise()._init(async.there(self.thisptr, deref(promise.thisptr), <PyObject *>func, <PyObject *>error_func))
 
-    cpdef yield_end(self):
-        return Promise()._init(async.yield_end(self.thisptr))
-
 cdef class Promise:
     cdef async.PyPromise * thisptr
     cdef public bint is_consumed

capnp/asyncHelper.h

@@ -33,10 +33,6 @@ PyObject * wrapPyFunc(PyObject * func, PyObject * arg) {
                                      , [error_func](kj::Exception arg) { return wrapPyFunc(error_func, wrap_kj_exception(arg)); } );
 }
 
-::kj::Promise<PyObject *> yield_end(kj::EventLoop & loop) {
-  return loop.there(loop.yield(), []() { Py_RETURN_NONE; } );
-}
-
 // class PyEventLoop final: public ::kj::EventLoop {
 // public:
 //   PyEventLoop() {}

capnp/async_cpp.pxd

@@ -30,7 +30,6 @@ cdef extern from "asyncHelper.h":
     PyPromise evalLater(EventLoop &, PyObject * func)
     PyPromise there(EventLoop & loop, PyPromise & promise, PyObject * func, PyObject * error_func)
     PyPromise then(PyPromise & promise, PyObject * func, PyObject * error_func)
-    PyPromise yield_end(EventLoop & loop)
 
     # cdef cppclass PyEventLoop(EventLoop):
     #     pass