Some packages which are using local gnulib source
are expecting files to exist in the directory:
staging_dir/host/share/gnulib/doc
so delete the other doc directories directly
instead of excluding all of them.
Fixes: d167adbc4 ("gettext-full: bootstrap to local gnulib source")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
7bfe7e0676