ocaml - Install libraries into lib/ocaml/site-lib

Made the "site-lib" folder a real folder, similar to how the Python brews work.
This will allow other ocaml softare to be built into this location instead of directly
into ocaml's Cellar.

Formula/objective-caml.rb

@@ -19,5 +19,9 @@ class ObjectiveCaml <Formula
     system "make opt"
     system "make opt.opt"
     system "make install"
+
+    # site-lib in the Cellar will be a symlink to the HOMEBREW_PREFIX location
+    (HOMEBREW_PREFIX+"lib/ocaml/site-lib").mkpath
+    ln_s HOMEBREW_PREFIX+"lib/ocaml/site-lib", lib+"ocaml/site-lib"
   end
 end