Make more compatible with opam (#114)

Author: ncik-roberts

src/frontend/dune

@@ -21,6 +21,7 @@
   -open Merlin_analysis
   -open Merlin_kernel)
  (libraries
+  merlin_extend
   merlin_utils
   merlin_kernel
   ocaml_utils

src/ocaml/compression/dune

@@ -7,4 +7,4 @@
    -open Merlin_utils
    (:standard -w -9))
   (modules_without_implementation annot outcometree mode_intf solver_intf value_rec_types)
-  (libraries merlin_utils ocaml_compression ocaml_parsing ocaml_utils))
+  (libraries merlin_utils ocaml_parsing ocaml_utils))