topkg-jbuilder is not needed for opam builds.

paurkedal · paurkedal · commit eb7e62c4ca51 · 2017-12-17T17:18:30.000+01:00
diff --git a/ppx_regexp.opam b/ppx_regexp.opam
@@ -11,6 +11,5 @@ depends: [
   "ocaml-migrate-parsetree"
   "re"
   "ppx_tools_versioned" {build}
-  "topkg-jbuilder" {build}
 ]
 available: [ocaml-version >= "4.02.3"]
