Update vendored runc to v1.0.0.0-rc94

Note that this is the code in containerd that uses runc (as almost
a library). Please see the other commit for the update to runc binary
itself.

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/cilium/ebpf/internal/pinning.go

@@ -0,0 +1,44 @@
+package internal
+
+import (
+	"errors"
+	"fmt"
+	"os"
+
+	"github.com/cilium/ebpf/internal/unix"
+)
+
+func Pin(currentPath, newPath string, fd *FD) error {
+	if newPath == "" {
+		return errors.New("given pinning path cannot be empty")
+	}
+	if currentPath == newPath {
+		return nil
+	}
+	if currentPath == "" {
+		return BPFObjPin(newPath, fd)
+	}
+	var err error
+	// Renameat2 is used instead of os.Rename to disallow the new path replacing
+	// an existing path.
+	if err = unix.Renameat2(unix.AT_FDCWD, currentPath, unix.AT_FDCWD, newPath, unix.RENAME_NOREPLACE); err == nil {
+		// Object is now moved to the new pinning path.
+		return nil
+	}
+	if !os.IsNotExist(err) {
+		return fmt.Errorf("unable to move pinned object to new path %v: %w", newPath, err)
+	}
+	// Internal state not in sync with the file system so let's fix it.
+	return BPFObjPin(newPath, fd)
+}
+
+func Unpin(pinnedPath string) error {
+	if pinnedPath == "" {
+		return nil
+	}
+	err := os.Remove(pinnedPath)
+	if err == nil || os.IsNotExist(err) {
+		return nil
+	}
+	return err
+}