eliminate gnulib subrepo (bug #57044) After this change, bootstrap will check out the gnulib sources to the revision set in the bootstrap.conf file. You may also use ./bootstrap --gnulib-srcdir=/path/to/gnulib to use an external copy of gnulib. If GNULIB_REVISION is unset, then the external repo will be updated to the version specified in bootstrap.conf. If GNULIB_REVISION is set in the environment when running bootstrap, that version will be used. If GNULIB_REVISION is set but empty, the current version in the external repo will be used: GNULIB_REVISION= ./bootstrap --gnulib-srcdir=/path/to/gnulib Thanks to Kai T. Ohlhus for the initial version of this change. * bootstrap.conf: Set GNULIB_REVISION unless it is already set in the environment. * .hgsub, .hgsubstate: Delete.

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