[patch] fix dbus-binding-tool to use GPtrArrays for arrays of non-fixed elements

[Robert McQueen]

Rob Taylor wrote:
> Currently bindings generated by dbus-binding-tool will segfault if
> arrays of structs or arrays of dicts are attempted to be used.
> This patch adds knowledge about GPtrArray to dbus-binding-tool.
> Its not the cleanest, but the code that its patching isn't the cleanest
> either....
> 
> Thanks,
> Rob Taylor

Looks fine, OK to commit?

Regards,
Rob