bug#25552: 26.0.50; load cl unintendedly

[Katsumi Yamaoka]

Recipe:

emacs -Q
M-x load-library RET gnus RET
C-h v gnus-summ SPC
C-g

Then (featurep 'cl) gets to return t.  It is because:
ûgnus.el has autoload settings that load gnus-mh for gnus-summ*.
ûgnus-mh.el requires mh-e.
ûmh-e.el requires mh-compat.
ûmh-compat.el requires mh-acros.
ûmh-acros.el requires cl unconditionally.
û`C-h v' seems to load things related to "gnus-summ".

I no longer have use for mh-e, so I added this to ~/.emacs:
(provide 'mh-e)

Regards,