Bug: Attempt to install notmuch-emacs.info during --without-emacs build

[Ralph Seichter]

MacPorts CI builds report the following [1]:


DEBUG: system:  cd "/opt/local/var/macports/build/_Users_vsts_agent_2.152.1_work_1_s_mail_notmuch/notmuch/work/notmuch-0.29" && ./configure --prefix=/opt/local --with-docs --without-emacs --without-ruby
[...]
Checking if emacs (>= 24) is available... No (so will not byte-compile emacs code)
[...]
/opt/local/var/macports/build/_Users_vsts_agent_2.152.1_work_1_s_mail_notmuch/notmuch/work/notmuch-0.29/doc/index.rst:7: WARNING: toctree contains reference to excluded document 'notmuch-emacs'
WARNING: "texinfo_documents" config value references unknown document notmuch-emacs
[...]
install -m0644 doc/_build/texinfo/notmuch-address.info doc/_build/texinfo/notmuch-compact.info doc/_build/texinfo/notmuch-config.info doc/_build/texinfo/notmuch-count.info doc/_build/texinfo/notmuch-dump.info doc/_build/texinfo/notmuch-emacs-mua.info doc/_build/texinfo/notmuch-insert.info doc/_build/texinfo/notmuch-new.info doc/_build/texinfo/notmuch-reindex.info doc/_build/texinfo/notmuch-reply.info doc/_build/texinfo/notmuch-restore.info doc/_build/texinfo/notmuch-search.info doc/_build/texinfo/notmuch-show.info doc/_build/texinfo/notmuch-tag.info doc/_build/texinfo/notmuch.info doc/_build/texinfo/notmuch-hooks.info doc/_build/texinfo/notmuch-properties.info doc/_build/texinfo/notmuch-search-terms.info doc/_build/texinfo/notmuch-emacs.info /opt/local/var/macports/build/_Users_vsts_agent_2.152.1_work_1_s_mail_notmuch/notmuch/work/destroot/opt/local/share/info
install: doc/_build/texinfo/notmuch-emacs.info: No such file or directory
make: *** [install-info] Error 71


Why is the build trying to install texinfo/notmuch-emacs.info even
though --without-emacs was specified during configuration and Emacs was
not found during the sanity checks?

[1] Full build log available at https://paste.z0k.xyz/8352cabdee6f.txt

-Ralph