Release 4.2.1

Author: aantron

src/core/dune

@@ -3,6 +3,5 @@
  (public_name lwt)
  (synopsis "Monadic promises and concurrent I/O")
  (wrapped false)
- (preprocess (pps bisect_ppx -conditional))
  (libraries bytes result seq)
  (flags (:standard -w +A-29)))

src/react/dune

@@ -11,5 +11,4 @@
  (synopsis "Reactive programming helpers for Lwt")
  (wrapped false)
  (libraries lwt react)
- (preprocess (pps bisect_ppx -conditional))
  (flags (:standard -w +A)))

src/unix/dune

@@ -58,7 +58,6 @@
  (optional)
  (wrapped false)
  (libraries bigarray lwt mmap threads unix)
- (preprocess (pps bisect_ppx -conditional))
  (flags (:standard -w +A-29))
  (c_names
   lwt_unix_stubs