This patch modifies the ARM syscall glue as follows:

* the macros syscallX that produce different code
  for syscalls with different number of arguments
  are replaced by the generic syscall thunk copied
  from libc;

* the syscall tables generation script is simplified
  since the syscall argument number analysis is redundant;

* the ARMv7 specific instruction MOVW is eliminated.
Signed-off-by: Alexander Kartashov <alekskartashov@parallels.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>