x86/syscalls/32: Wire up arch_prctl on x86-32

Hook up arch_prctl to call do_arch_prctl() on x86-32, and in 32 bit compat
mode on x86-64. This allows to have arch_prctls that are not specific to 64
bits.

On UML, simply stub out this syscall.

Signed-off-by: Kyle Huey <[email protected]>
Cc: Grzegorz Andrejczuk <[email protected]>
Cc: [email protected]
Cc: Radim Krčmář <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: [email protected]
Cc: Nadav Amit <[email protected]>
Cc: Robert O'Callahan <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
Cc: Jeff Dike <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: [email protected]
Cc: David Matlack <[email protected]>
Cc: Boris Ostrovsky <[email protected]>
Cc: Dmitry Safonov <[email protected]>
Cc: [email protected]
Cc: Paolo Bonzini <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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