libobjc - more work on headers (2)

[Nicola Pero]

Committed to trunk.

Thanks

2010-10-10  Nicola Pero  <nicola.pero@meta-innovation.com>

        * objc/objc-api.h: Define Method, Method_t, Category and
        Category_t.  Prevent including this file at the same time as
        objc/runtime.h.  Updated comments.
        * objc/deprecated/struct_objc_method.h: Do not define Method,
        Method_t.
        * objc/deprecated/struct_objc_category.h: Do not define Category,
        Category_t.
        * objc-private/module-abi-8.h: New file containing a copy of all
        the structure definitions.  Not used yet.
        * objc/encoding.h (objc_aligned_size): Removed duplicate
        declaration.  Updated comments.
        * objc/runtime.h: Added Ivar, objc_property_t, Property, Method,
        Category, struct objc_method_description, _C_ID and similar,
        _C_CONST and similar and _F_CONST and similar.  Added
        objc_sizeof_type, objc_alignof_type, objc_aligned_size,
        objc_promoted_size, objc_skip_type_qualifier, objc_skip_typespec,
        objc_skip_offset, objc_skip_argspec, objc_get_type_qualifiers,
        struct objc_struct_layout, objc_layout_structure,
        objc_layout_structure_next_member, objc_layout_finish_structure,
        objc_layout_structure_get_info.  Prevent including this file at
        the same time as objc/objc-api.h.

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