From: David Gibson <david@gibson.dropbear.id.au>

Currently ppc64 has its own code to convert 32-bit ipc() syscalls to 64-bit,
rather than using the common translation code from ipc/compat.c.  This patch,
tweaked slightly from an earlier version of Anton Blanchard's fixes that,
replacing the ppc64 code with calls to the common code.

I've run the LSB IPC tests, and as many of the LTP IPC tests as I could figure
out how to run easily, and it seems to pass them all.