maint: update to latest gnulib
maint: update to latest gnulib

Upstream gnulib determined that we were needlessly compiling in
gnulib's regex instead of glibc's when targetting new-enough glibc,
because the m4 test was being too strict in requiring a particular
answer to undefined behavior.
https://lists.gnu.org/archive/html/bug-gnulib/2013-04/msg00032.html

* .gnulib: Update to latest, for regex.

crobinso/libvirt,eskultety/libvirt,taget/libvirt,jardasgit/libvirt,rlaager/libvirt,jardasgit/libvirt,datto/libvirt,cbosdo/libvirt,shugaoye/libvirt,agx/libvirt,agx/libvirt,rlaager/libvirt,eskultety/libvirt,datto/libvirt,zhlcindy/libvirt-1.1.4-maintain,andreabolognani/libvirt,nertpinx/libvirt,rlaager/libvirt,shugaoye/libvirt,taget/libvirt,taget/libvirt,shugaoye/libvirt,VenkatDatta/libvirt,cbosdo/libvirt,nertpinx/libvirt,zhlcindy/libvirt-1.1.4-maintain,agx/libvirt,VenkatDatta/libvirt,datto/libvirt,zippy2/libvirt,fabianfreyer/libvirt,libvirt/libvirt,taget/libvirt,libvirt/libvirt,rlaager/libvirt,crobinso/libvirt,jardasgit/libvirt,zippy2/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,zippy2/libvirt,andreabolognani/libvirt,elmarco/libvirt,VenkatDatta/libvirt,jfehlig/libvirt,agx/libvirt,olafhering/libvirt,datto/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,elmarco/libvirt,shugaoye/libvirt,cbosdo/libvirt,elmarco/libvirt,andreabolognani/libvirt,olafhering/libvirt,jfehlig/libvirt,VenkatDatta/libvirt,libvirt/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,eskultety/libvirt,fabianfreyer/libvirt,elmarco/libvirt,eskultety/libvirt,jardasgit/libvirt,crobinso/libvirt,crobinso/libvirt,cbosdo/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,agx/libvirt,taget/libvirt,fabianfreyer/libvirt,libvirt/libvirt,fabianfreyer/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,shugaoye/libvirt,nertpinx/libvirt,zippy2/libvirt,olafhering/libvirt,elmarco/libvirt,VenkatDatta/libvirt,eskultety/libvirt,datto/libvirt,cbosdo/libvirt,jardasgit/libvirt,fabianfreyer/libvirt