ber_metaocaml: fix install order.

Indeed, all standard modules with compiler-libs are not included (
eg. Optcompile).

closes #77680

pkgs/development/compilers/ocaml/ber-metaocaml.nix

@@ -50,10 +50,10 @@ stdenv.mkDerivation rec {
 
   buildPhase = ''
     make world
-    make -i install
 
     make bootstrap
     make opt.opt
+    make -i install
     make installopt
     mkdir -p $out/include
     ln -sv $out/lib/ocaml/caml $out/include/caml