remove unneeded tests with otherwise add qtest dependency

Index: ocamldeps/gen/src/dune
--- ocamldeps/gen/src/dune.orig
+++ ocamldeps/gen/src/dune
@@ -14,6 +14,5 @@
   (flags :standard -w +a-4-42-44-48-50-58-32-60@8 -safe-string -nolabels)
   (ocamlopt_flags :standard (:include flambda.flags))
   (libraries bytes)
-  (inline_tests (backend qtest.lib))
   )