Update syscall lists for Linux 6.11

Update syscall lists for Linux 6.11

Linux 6.11 changes for syscall are:

  * fstat/newfstatat for loongarch (it should be safe to add since
    255dc1e4ed8 that undefine them).
  * clone3 for nios2, which only adds the entry point but defined
    __ARCH_BROKEN_SYS_CLONE3 (the syscall will always return ENOSYS).
  * uretprobe for x86_64 and x32.

Update syscall-names.list and regenerate the arch-syscall.h headers
with build-many-glibcs.py update-syscalls.

Tested with build-many-glibcs.py.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>