nim: propagate Security framework to all nim packages on darwin

Many nim packages regressed on darwin after 31254120db, which upgrade nim to 1.6.12. The cause of the breakage is that the nim standard library was changed to link against the Security framework when using the system rng on darwin. Notably not *all* nim packages were broken by this, since packages that don't use this part of the standard library don't need the framework to build.

This commit adds the Security framework to the depsTargetTargetPropagated for the compiler wrapper, since the standard library isn't fully functional without it.

pkgs/development/compilers/nim/default.nix

@@ -203,6 +203,10 @@ in {
 
       nativeBuildInputs = [ makeWrapper ];
 
+      # Needed for any nim package that uses the standard library's
+      # 'std/sysrand' module.
+      depsTargetTargetPropagated = lib.optional stdenv.isDarwin Security;
+
       patches = [
         ./nim.cfg.patch
         # Remove configurations that clash with ours