x86: x86 ptrace merge removals

This removes the old separate 64-bit and ia32 ptrace source files.
They are no longer used.

Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>