$NetBSD$

Avoid pipenv dependency.

--- semgrep-core/src/core/ast/dune.orig	2022-07-25 09:57:31.003633884 +0000
+++ semgrep-core/src/core/ast/dune
@@ -48,8 +48,7 @@
   (action
     (no-infer
       (progn
-        (run pipenv install)
-        (run pipenv run python3 gen_lang.py)
+        (run python3 gen_lang.py)
       )
     )
   )
