Disable safe_string for some files using Lwt
Disable safe_string for some files using Lwt

The Lwt API has changed in an incompatible way.
Reported by Jeremy Yallop:

https://github.com/ocaml/opam-repository/pull/3456

bastianeicher/0install,pombreda/0install,gfxmonk/0install,pombreda/0install,bastianeicher/0install,gasche/0install,DarkGreising/0install,gasche/0install,gasche/0install,HoMeCracKeR/0install,HoMeCracKeR/0install,0install/0install,DarkGreising/0install,0install/0install,gfxmonk/0install,pombreda/0install,jaychoo/0install,bastianeicher/0install,DarkGreising/0install,0install/0install,jaychoo/0install,HoMeCracKeR/0install,jaychoo/0install,gfxmonk/0install,gasche/0install