Bump libcompose and sync dependencies

vendor/github.com/cloudfoundry/gosigar/sigar_util.go

@@ -1,22 +0,0 @@
-// Copyright (c) 2012 VMware, Inc.
-
-package sigar
-
-import (
-	"unsafe"
-)
-
-func bytePtrToString(ptr *int8) string {
-	bytes := (*[10000]byte)(unsafe.Pointer(ptr))
-
-	n := 0
-	for bytes[n] != 0 {
-		n++
-	}
-
-	return string(bytes[0:n])
-}
-
-func chop(buf []byte) []byte {
-	return buf[0 : len(buf)-1]
-}