Bug 560248 – "disguised structures"

Bug 560248 – "disguised structures"

Certain types like GIConv and GdkAtom are pointers internally but don't
look like pointers when referenced. They have the form.

 typedef struct _X *X;

Parse these as structures/records but mark them in the gir with a 'disguised'
attribute so that we know that they need special handling.

In the typelib treat them like any other structure.

svn path=/trunk/; revision=872