Don't install manpages for command aliases

opam.install

@@ -12,22 +12,17 @@ man: [
   "?doc/man/opam-admin-make.1"
   "?doc/man/opam-admin-stats.1"
   "?doc/man/opam-config.1"
-  "?doc/man/opam-help.1"
-  "?doc/man/opam-info.1"
   "?doc/man/opam-init.1"
   "?doc/man/opam-install.1"
   "?doc/man/opam-installer.1"
   "?doc/man/opam-list.1"
   "?doc/man/opam-pin.1"
   "?doc/man/opam-reinstall.1"
-  "?doc/man/opam-remote.1"
   "?doc/man/opam-remove.1"
   "?doc/man/opam-repository.1"
   "?doc/man/opam-search.1"
   "?doc/man/opam-show.1"
   "?doc/man/opam-switch.1"
-  "?doc/man/opam-uninstall.1"
-  "?doc/man/opam-unpin.1"
   "?doc/man/opam-update.1"
   "?doc/man/opam-upgrade.1"
 ]