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People have been asking for ways to use the ABI macros, heres some docs to clarify their use. Included is: * An overview of what ABI is * Details of the ABI deprecation process * Details of the versioning macros * Examples of their use * Details of how to use the ABI validator Thanks to John Mcnamara, who duplicated much of this effort at Intel while I was working on it. Much of the introductory material was gathered and cleaned up by him. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: John McNamara <john.mcnamara@intel.com> Acked-by: Thomas Monjalon <thomas.monjalon@6wind.com>