Apply dos2unix to script bin files

After we started generating our own bin links, we did not provide the
line-ending normalization that npm did. This corrects that to have
similar behavior to before for packages with CRLF line-endings.

nix/node-env.nix

@@ -535,6 +535,8 @@ let
             do
                 file="$(readlink -f "$i")"
                 chmod u+rwx "$file"
+                isScript "$file" || continue
+                sed -i 's/\r$//' "$file"  # convert crlf to lf
                 patchShebangs "$file"
             done
         fi