Project deal.II added libtool for req. packages on EL6/7 & F19/20

 Changes to be committed:
	modified:   deal.II/platforms/supported/centos7.platform
	modified:   deal.II/platforms/supported/fedora19.platform
	modified:   deal.II/platforms/supported/rhel6.platform
	modified:   deal.II/platforms/supported/rhel7.platform