Bump libcompose and sync dependencies

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

@@ -1,26 +0,0 @@
-// Copyright (c) 2012 VMware, Inc.
-
-// +build darwin freebsd linux netbsd openbsd
-
-package sigar
-
-import "syscall"
-
-func (self *FileSystemUsage) Get(path string) error {
-	stat := syscall.Statfs_t{}
-	err := syscall.Statfs(path, &stat)
-	if err != nil {
-		return err
-	}
-
-	bsize := stat.Bsize / 512
-
-	self.Total = (uint64(stat.Blocks) * uint64(bsize)) >> 1
-	self.Free = (uint64(stat.Bfree) * uint64(bsize)) >> 1
-	self.Avail = (uint64(stat.Bavail) * uint64(bsize)) >> 1
-	self.Used = self.Total - self.Free
-	self.Files = stat.Files
-	self.FreeFiles = stat.Ffree
-
-	return nil
-}