Bug#1015719: libc6-dev: Build glibc with latest packaged kernel version

[Florian Weimer <fweimer@redhat.com>]

* Alejandro Colomar via Libc-alpha:

> Is there an easy way to regenerate that header to get the tatest
> syscalls?  Maybe a command could be supplied so that users (or at
> least distributors) have it easy to regenerate them?  Maybe it already
> exists but it's not widely known?

I have recently backported the syscall-names.list updates to glibc 2.34,
but not glibc 2.33.  It's a simple backport.

We could perhaps enhance the glibc build process that it uses the union
of the known system call names and what's found in the kernel headers.

Thanks,
Florian