Add --enable-ia2 configuration option

Change-Id: I950c47bd95d5bb4aacf9e584c8e2eeef461af71f
Add custom target to process IA2 COM idl files

Change-Id: Id20cba53fc21eaa396c3a3d3ed8fa1eb9fdb4978
Gbuildify UAA to IA2 bridge

Change-Id: I1aae7ec50c3bb78ac1035d70eaf39c6efef465ab
Gbuildify winaccessibility service

Conflicts:
	winaccessibility/source/UAccCOM/UAccCOM.def
	winaccessibility/source/service/AccObjectWinManager.cxx
	winaccessibility/source/service/checkmt.cxx
	winaccessibility/source/service/checkmt.hxx

Change-Id: Ia66872bee7c70c840c1bd5caa626bf63eac9ef7c
Remove WNT define

Change-Id: Ia69141f58fad25797d7d7495a357dd18c7abf08d