build: update to latest gnulib
build: update to latest gnulib

In particular, pull in gnulib's fix for the broken AC_HEADER_MAJOR
macro in autoconf.

Signed-off-by: Eric Blake <a9da18479c871fe903d9590822cfe2629c6a4d11@redhat.com>

datto/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,libvirt/libvirt,olafhering/libvirt,datto/libvirt,zippy2/libvirt,taget/libvirt,zippy2/libvirt,datto/libvirt,VenkatDatta/libvirt,taget/libvirt,zippy2/libvirt,jfehlig/libvirt,eskultety/libvirt,libvirt/libvirt,jfehlig/libvirt,andreabolognani/libvirt,nertpinx/libvirt,taget/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,datto/libvirt,jardasgit/libvirt,eskultety/libvirt,libvirt/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,crobinso/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jardasgit/libvirt,crobinso/libvirt,nertpinx/libvirt,andreabolognani/libvirt,crobinso/libvirt,andreabolognani/libvirt,eskultety/libvirt,zippy2/libvirt,jfehlig/libvirt,nertpinx/libvirt,datto/libvirt,VenkatDatta/libvirt,crobinso/libvirt,eskultety/libvirt,eskultety/libvirt,andreabolognani/libvirt,taget/libvirt,fabianfreyer/libvirt,taget/libvirt,jfehlig/libvirt,olafhering/libvirt