Fix import.h to translate stdio.h after this header in FreeBSD
Improve Ada.Task_Identification.Image
Remark
Use no System.Unsigned_Types
Improve error-checking of Interfaces.C.To_C and To_Ada in Windows
Delete unnecessary package names
Merge commit 'b8928d6' into gcc-4.7

Conflicts:
	source/a-except.ads (modified)