Fix virCgroupAvailable() w/o HAVE_GETMNTENT_R defined
Fix virCgroupAvailable() w/o HAVE_GETMNTENT_R defined

virCgroupAvailable() implementation calls getmntent_r
without checking if HAVE_GETMNTENT_R is defined, so it fails
to build on platforms without getmntent_r support.

Make virCgroupAvailable() just return false without
HAVE_GETMNTENT_R.

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