vendor: update buildkit with typed errors support

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

vendor/github.com/moby/term/tc.go

@@ -0,0 +1,19 @@
+// +build !windows
+
+package term
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+func tcget(fd uintptr) (*Termios, error) {
+	p, err := unix.IoctlGetTermios(int(fd), getTermios)
+	if err != nil {
+		return nil, err
+	}
+	return (*Termios)(p), nil
+}
+
+func tcset(fd uintptr, p *Termios) error {
+	return unix.IoctlSetTermios(int(fd), setTermios, (*unix.Termios)(p))
+}