Update vim to support builds with x11 and REHL tlib.

Adding --with-x option to support gui vim builds.

Changing tlib from ncurses to tinfo to support RHEL builds. Documented
in thread:
http://www.mail-archive.com/vim_dev@googlegroups.com/msg11852.html

Removing STRIP modification on make install.
Update graphviz and libpng for RHEL installs.

Modify graphviz to remove special libpng dependency and app build
option.