Update syscall lists for Linux 5.19

Linux 5.19 has no new syscalls, but enables memfd_secret in the uapi
headers for RISC-V.  Update the version number in syscall-names.list
to reflect that it is still current for 5.19 and regenerate the
arch-syscall.h headers with build-many-glibcs.py update-syscalls.

Tested with build-many-glibcs.py.