Fix HsOpenSSL tests

Author: hamishmack

test/th-dlls/default.nix

@@ -8,7 +8,7 @@ let
     inherit compiler-nix-name evalPackages;
     src = testSrc "th-dlls";
     cabalProjectLocal = builtins.readFile ../cabal.project.local;
-    modules = [({pkgs, ...}: lib.optionalAttrs externalInterpreter {
+    modules = import ../modules.nix ++ [({pkgs, ...}: lib.optionalAttrs externalInterpreter {
       packages.th-dlls.components.library.ghcOptions = [ "-fexternal-interpreter" ];
       # Static openssl seems to fail to load in iserv for musl
       packages.HsOpenSSL.components.library.libs = lib.optional pkgs.stdenv.hostPlatform.isMusl (pkgs.openssl.override { static = false; });