Build original Ada port core, V client, and x86-64 boot milestone

abi/agila_abi.ads

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+with Interfaces;
+with Interfaces.C;
+package Agila_ABI is
+   subtype Word is Interfaces.Unsigned_32;
+   subtype Code is Interfaces.C.int;
+   function Create (Owner : Word) return Word
+     with Export, Convention => C, External_Name => "agila_port_create";
+   function Allow_Sender (Handle, Owner, Sender : Word) return Code
+     with Export, Convention => C, External_Name => "agila_port_allow_sender";
+   function Revoke_Sender (Handle, Owner, Sender : Word) return Code
+     with Export, Convention => C, External_Name => "agila_port_revoke_sender";
+   function Send (Handle, Caller, Value : Word) return Code
+     with Export, Convention => C, External_Name => "agila_port_send";
+   function Receive (Handle, Caller : Word; Value : access Word) return Code
+     with Export, Convention => C, External_Name => "agila_port_receive";
+   function Close (Handle, Caller : Word) return Code
+     with Export, Convention => C, External_Name => "agila_port_close";
+end Agila_ABI;