sharutils-4.15.2 fails to build with glibc-2.28 prerelease

[Petr Pisar]

Hello,

when rebuilding sharutils in Fedora Rawhide that has glibc 2.28 prerelease,
I found it fails to build:

fseeko.c: In function 'rpl_fseeko':
fseeko.c:110:4: error: #error "Please port gnulib fseeko.c to your platform! Look at the code in fseeko.c, then report this to bug-gnulib."
#error "Please port gnulib fseeko.c to your platform! Look at the code in fseeko.c, then report this to bug-gnulib."

The reason is bundled gnulib files need to adapt to changes in glibc. This is
the same issue as the one already reported and resolved in gnulib
<https://lists.gnu.org/r/bug-gnulib/2018-03/msg00000.html>. Fedora's patch
that ports the required changes to sharutils-4.15.2
<https://src.fedoraproject.org/rpms/sharutils/raw/master/f/sharutils-4.15.2-fflush-adjust-to-glibc-2.28-libio.h-removal.patch>
fixes it.

-- Petr