do not require two ./autogen.sh runs to permit "make"
do not require two ./autogen.sh runs to permit "make"

* autogen.sh (bootstrap_hash): New function.
Running bootstrap may update the gnulib SHA1, yet we were computing
t=$(git submodule status ...) *prior* to running bootstrap, and
then recording that sometimes-stale value in the stamp file upon
a successful bootstrap run.  That would require two (lengthy!)
bootstrap runs to update the stamp file.

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