[PATCH] PPC64 umount fix.

[Steve Munroe]

For PPC64 native builds unount does not work because default umount uses 
syscall(NR__umount, ...) which is not implemented for PPC64. The best 
solution is to forward all umount calls to umount2 like hppa umount.c.

Thanks to Marcus Meisser for pointing this out.

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