Remove some more KDE4 ports and hopefully fix INDEX again
2019-03-15 textproc/uim-kde4: Qt4 has been EOL since december 2015
misc/kde4-xdg-env
x11-themes/wallpapers-freebsd-kde4
Give the KDE SC4 applications ports a -kde4 suffix
In order to make room for the up-to-date version of the KDE Desktop and its
applications move the KDE Application ports based on Qt4.
PR: 225992
Exp-run by: antoine
Reviewed by: rakuco, adridg
Differential Revision: https://reviews.freebsd.org/D14413