Opam: use the libev backend of Lwt.

scripts/Dockerfile.binaries.in

@@ -4,7 +4,7 @@ LABEL distro_style="apk" distro="alpine" distro_long="alpine-$alpine_version" ar
 
 RUN apk update && \
     apk upgrade && \
-    apk add sudo bash libssl1.0 libsodium gmp git && \
+    apk add sudo bash libssl1.0 libsodium libev gmp git && \
     rm -f /var/cache/apk/* && \
     adduser -S tezos && \
     echo 'tezos ALL=(ALL:ALL) NOPASSWD:ALL' > /etc/sudoers.d/tezos && \

src/tezos-deps.opam

@@ -15,6 +15,7 @@ depends: [
   "ocamlfind" {build}
   "base-bigarray"
   "base-threads"
+  "conf-libev"
   "calendar"
   "cohttp" {>= "0.21" }
   "conduit"

src/utils/lwt_utils.ml

@@ -7,10 +7,6 @@
 (*                                                                        *)
 (**************************************************************************)
 
-(** HACK waiting for Pierre.... *)
-let () = Lwt_unix.set_default_async_method Async_none
-(** END OF HACK waiting for Pierre.... *)
-
 module LC = Lwt_condition
 
 open Lwt.Infix