abuild: fix fetch lock file on nfs
flock(2) on an NFS mount will on the server side convert the lock to a POSIX lock (fcntl(F_SETLK)). This means that abuild running on NFS server and client will create different locks and they will both try download same file at same time. We fix this by creating a small abuild-fetch application that will create a POSIX lock which works with NFS.
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