[1] Warn people about Qt1, remove warning about Qt3, and fix something I
    forgot to fix before committing the Qt3/KDE3 stuff.

[2] Programs that were using USE_QT_VER=3 were looking in the wrong
    place for the headers if they relied solely on QTCPPFLAGS to give
    it to them.

Reported by:	[2] Frank Laszlo <laszlof@earthlink.net>