add ERRNO for fchmodat2
Linux kernel 6.6 will add the fchmodat2 syscall as a new variant of fchmodat which is already in use by zathura.
This MR will avoid hard sandbox fails in case dependencies switch over to the new system call.
Linux kernel 6.6 will add the fchmodat2 syscall as a new variant of fchmodat which is already in use by zathura.
This MR will avoid hard sandbox fails in case dependencies switch over to the new system call.