For ARCHFLAGS change, see:
http://www.ruby-forum.com/topic/129717#579065

We also add a test for the <guestfs.h> header and include
that header when testing the library.

Git users now require the OCaml compiler in order to regenerate
the generated code after a checkout.

Generated code will remain in the tarball, so users of the
source tarball will not need the OCaml compiler.

This adds a readdir call (mostly intended for programs).  The
return value is a list of guestfs_dirent structures.

This adds the new types 'struct guestfs_dirent' and
'struct guestfs_dirent_list', along with all the code to
return these in the different language bindings.

Also includes additional tests for OCaml and Perl bindings
to test this.