Mark more tests as having external deps

Signed-off-by: Rudi Grinberg <rudi.grinberg@gmail.com>

test/blackbox-tests/dune.inc

@@ -880,7 +880,6 @@
   (alias findlib)
   (alias findlib-error)
   (alias force-test)
-  (alias gen-opam-install-file)
   (alias github1019)
   (alias github20)
   (alias github24)
@@ -925,7 +924,6 @@
   (alias redirections)
   (alias reporting-of-cycles)
   (alias scope-bug)
-  (alias scope-ppx-bug)
   (alias select)
   (alias shadow-bindings)
   (alias subst)

test/blackbox-tests/gen_tests.ml

@@ -137,6 +137,8 @@ let exclusions =
   ; make "utop"~external_deps:true
   ; make "configurator" ~skip_platforms:[Win]
   ; make "github764" ~skip_platforms:[Win]
+  ; make "gen-opam-install-file" ~external_deps:true
+  ; make "scope-ppx-bug" ~external_deps:true
   ]
 
 let all_tests = lazy (