build: Fix build with -Werror
build: Fix build with -Werror

Commit 752596b5 broke the build with -Werror

qemu/qemu_hotplug.c: In function 'qemuDomainChangeGraphics':
qemu/qemu_hotplug.c:1980:39: error: declaration of 'listen' shadows a
  global declaration [-Werror=shadow]

Fix with s/listen/newlisten/

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