libct/utils: remove deprecated cmsg wrappers

RecvFile, SendFile, and SendRawFd were moved to an internal package
in runc 1.5, and the wrappers left in libcontainer/utils were
deprecated, with a note that they will be removed in runc 1.6.

Remove them.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

CHANGELOG.md

@@ -13,6 +13,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   accordingly. This lifts the previous 1024 CPUs/nodes limit. (#5343)
 - The deprecated `libcontainer/devices` package has been removed. Use
   `github.com/moby/sys/devices` instead. (#5142, #5223, #5495)
+- The deprecated `RecvFile`, `SendFile`, and `SendRawFd` functions have been
+  removed from `libcontainer/utils`. (#5227, #5231, #5495)
 
 ### Fixed ###
 - The poststart hooks are now executed after starting the user-specified

libcontainer/utils/cmsg_deprecated.go

@@ -1,35 +0,0 @@
-package utils
-
-import (
-	"os"
-
-	"github.com/opencontainers/runc/internal/cmsg"
-)
-
-// RecvFile waits for a file descriptor to be sent over the given AF_UNIX
-// socket. The file name of the remote file descriptor will be recreated
-// locally (it is sent as non-auxiliary data in the same payload).
-//
-// Deprecated: This method is deprecated and has been moved to an internal
-// package (see [cmsg.RecvFile]). It will be removed in runc 1.6.
-func RecvFile(socket *os.File) (*os.File, error) {
-	return cmsg.RecvFile(socket)
-}
-
-// SendFile sends a file over the given AF_UNIX socket. file.Name() is also
-// included so that if the other end uses RecvFile, the file will have the same
-// name information.
-//
-// Deprecated: This method is deprecated and has been moved to an internal
-// package (see [cmsg.SendFile]). It will be removed in runc 1.6.
-func SendFile(socket, file *os.File) error {
-	return cmsg.SendFile(socket, file)
-}
-
-// SendRawFd sends a specific file descriptor over the given AF_UNIX socket.
-//
-// Deprecated: This method is deprecated and has been moved to an internal
-// package (see [cmsg.SendRawFd]). It will be removed in runc 1.6.
-func SendRawFd(socket *os.File, msg string, fd uintptr) error {
-	return cmsg.SendRawFd(socket, msg, fd)
-}