added BROKEN_ISTREAM_HACK check to routines that bypass StdIO
added BROKEN_ISTREAM_HACK check to routines that bypass StdIO

oglops/PyIlmBase,oglops/PyIlmBase,oglops/IlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/IlmBase,oglops/OpenEXR,oglops/PyIlmBase,oglops/IlmBase,oglops/OpenEXR