MFC rev 1.29 and 1.30: Use __QUAD_LOWWORD for __syscall, to always use the good word, whatever the endianness is.
MFC rev 1.29 and 1.30:
Use __QUAD_LOWWORD for __syscall, to always use the good word, whatever the
endianness is.

Special casing of __syscall return value for big endian.

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