build: avoid m4_expand for RHEL 5
build: avoid m4_expand for RHEL 5

Problem introduced in commit cd699ed.

* m4/virt-lib.m4 (LIBVIRT_CHECK_LIB, LIBVIRT_CHECK_PKG): Set up
direct expansions, since autoconf 2.59 lacked m4_expand.

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