nixos/stage-1: srestore striping of bin/ and lib/

commit 0507725061 ("setup-hooks/strip.sh: run RANLIB on static
archives after stripping") added an extra argument to `stripDirs()`
helper.

I did not realize it's used outside the strip hook itself. Restore
stripping by passing $RANLIB as a new argument.

nixos/modules/system/boot/stage-1.nix

@@ -219,7 +219,7 @@ let
 
       # Strip binaries further than normal.
       chmod -R u+w $out
-      stripDirs "$STRIP" "lib bin" "-s"
+      stripDirs "$STRIP" "$RANLIB" "lib bin" "-s"
 
       # Run patchelf to make the programs refer to the copied libraries.
       find $out/bin $out/lib -type f | while read i; do