Mark soup_message_io_cleanup as available
Mark soup_message_io_cleanup as available

Even if it is private it was exported before
so we need to keep it that way.

https://bugzilla.gnome.org/show_bug.cgi?id=757146

fanc999/libsoup,jwendell/libsoup,jwendell/libsoup,jwendell/libsoup,jwendell/libsoup,fanc999/libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup