patch to remove KDE3/QT3

[René Ladan]

Hi,

(CC'd maintainers of ports that are scheduled for removal)

I have prepared a patch to remove the KDE3 and QT3 ports, it is
available at [1]. This patch also:
- removes ports/Mk/bsd.kde.mk (only used for KDE3/QT3)
- patches bsd.port.mk (removes USE_KDEBASE_VER, USE_KDELIBS_VER, USE_QT_VER)
- undocuments the KDE and QT knobs (ports should use the KDE4 and QT4
knobs instead)
- updates CHANGES

Two more ports, graphics/kipi-plugins net-p2p/museekplus, use QT3 but
are not part of KDE3 and can easily be modified to live without. I have
PRs for those to their maintainers.

A local INDEX-9 build is fine, not sure if we want an exp-run for this?

[1] ftp://rene-ladan.nl/pub/freebsd/kde3-rm.diff
% ls -l kde3-rm.diff
-rw-r--r--  1 rene  ftp  7811874 Jul  2 22:10 kde3-rm.diff
% sha256 kde3-rm.diff
SHA256 (kde3-rm.diff) =
91d7dc21a7121fc8121d73959067d795e0941d5f4a1d64de0c06915adc4febe3
%

Regards,
René