sexplib: rename from ocaml_sexplib to sexplib

There really isn't any need for it to be named ocaml_sexplib

pkgs/development/ocaml-modules/ocaml-ipaddr/default.nix

@@ -1,15 +1,15 @@
-{ocaml, findlib, stdenv, fetchurl, ocaml_sexplib}:
+{ocaml, findlib, stdenv, fetchurl, sexplib}:
 assert stdenv.lib.versionAtLeast (stdenv.lib.getVersion ocaml) "3.12";
 stdenv.mkDerivation {
   name = "ocaml-ipaddr-2.5.0";
-  
+
   src = fetchurl {
     url = https://github.com/mirage/ocaml-ipaddr/archive/2.5.0.tar.gz;
     sha256 = "0zpslxzjs5zdw20j3jaf6fr0w2imnidhrzggmnvwp198r76aq917";
   };
 
   buildInputs = [ocaml findlib];
-  propagatedBuildInputs = [ocaml_sexplib];
+  propagatedBuildInputs = [sexplib];
 
   createFindlibDestdir = true;
 
@@ -19,5 +19,5 @@ stdenv.mkDerivation {
     maintainers = [ maintainers.vbgl ];
     platforms = ocaml.meta.platforms;
   };
-  
+
 }