[PATCH] Linux: Add memfd_create system call wrapper

[Florian Weimer]

On 11/24/2017 05:16 PM, Joseph Myers wrote:
> This breaks the testsuite build for hppa, which does not use mman-linux.h
> (i.e. the new declarations also need to be added to the hppa bits/mman.h).

I have more declarations and definitions to add which are not 
arch-specific at all, so I'll prepare a patch which adds another header 
which contributes to <sys/mman.h>.

Thanks,
Florian