ftpsync locking

have three ways of locking, depending on the bash version
old bash (older than 4 :) ) does not have BASHPID variable, nor a
good way to find the pid of a backgrounded subshell. so if we have
old bash, go the way of guessing if its still running, by comparing
the age of the LOCK file or by taking our proc/self target as pid

Signed-off-by: Joerg Jaspert <joerg@debian.org>

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