Update syscall lists for Linux 6.5

Linux 6.5 has one new syscall, cachestat, and also enables the
cacheflush syscall for hppa.  Update syscall-names.list and regenerate
the arch-syscall.h headers with build-many-glibcs.py update-syscalls.

Tested with build-many-glibcs.py.

(cherry picked from commit 72511f53)