Fix compile issues on gcc 4.1.x related to namespaces.

Fix compile issues on gcc 4.1.x related to namespaces.
This basically involves moving the builder code outside of any
namespace.  While we're at it, move a few braces outside of
a couple #if/#else/#endif blocks so it's easier to match up
the braces.

--HG--
extra : convert_revision : a7834532aadc63b0e0ff988dd5745049e02e6312