bootstrap: Ensure shallow gnulib clone works on newer git
Update the bootstrap script to be compatible with newer versions of git that changed the "git clone -h" output from containing: --depth to: --[no-]depth This bootstrap script is pulled the latest gnulib version from gnulib git, commit 9a1a6385 (Silence 'time-stamp' warnings with bleeding-edge Emacs.). This change avoids a full clone on gnulib, saving something like 50 MB. Fixes: https://savannah.gnu.org/bugs/?66357 Signed-off-by: Andrew Hamilton <adhamilt@gmail.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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