This is the functional update of xpdf to xpdf 4.00.

graphics/xpdf is renamed (actually copied) to xpdf3. Those who want to
continue to use xpdf with a Motif interface can either install xpdf3 or
set XPDF_VERSION=3 in make.conf and continue to install graphics/xpdf.
This works around any POLA issues people might have between the
old and the new.

PR: 222002