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According to the POSIX standard, cc_t, speed_t, and tcflag_t should be unsigned integer types. Define cc_t as unsigned to match POSIX and fix an implicit conversion error when building StdLib with XCODE5/CLANG38. Cc: Daryl McDaniel <edk2-lists@mc2research.org> Cc: Jaben Carsey <jaben.carsey@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Alex James <theracermaster@gmail.com> Reviewed-by: Jaben Carsey <jaben.carsey@intel.com>