x86: x86 ia32_binfmt removal

Remove the old ia32_binfmt.c file, which is 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>