[PATCH] x32: Add <asm/unistd_x32.h> and regenerate arch-syscall.h

[Florian Weimer]

* H. J. Lu:

> It doesn't work in this case.  <fixup-asm-unistd.h> is used to undefine or
> redefine a syscall from <asm/unistd.h>.   The actual syscall numbers still
> come from <asm/unistd.h>.  In this case, the sycall number is missing from
> <asm/unistd_x32.h>.   My patch is a prerequisite for a new testcase:
>
> ../sysdeps/unix/sysv/linux/x86/tst-sigreturn-1.c: In function ‘setup_ldt’:
> ../sysdeps/unix/sysv/linux/x86/tst-sigreturn-1.c:258:14: error:
> ‘SYS_set_thread_area’ undeclared (first use in this function)
>   258 |  if (syscall(SYS_set_thread_area, &gdt_data16_desc) == 0) {
>       |              ^~~~~~~~~~~~~~~~~~~

Can you make it an internal test and use __NR_set_thread_area?

Thanks,
Florian