FreeBSD/ports d633db0 (r496296)Mk/Uses kde.mk qt.mk

kde.mk, qt.mk: Prefix component variables to avoid clashes.

r496074 was necessary because both kde.mk and qt.mk were setting wayland_LIB
and wayland_PORT, and qt.mk overrode the version in kde.mk.

Follow what we do in pyqt.mk and prefix the component variables to avoid future
clashes.

Reviewed by:    tcberner
Differential Revision:  https://reviews.freebsd.org/D19631
DeltaFile
+375-375Mk/Uses/kde.mk
+150-150Mk/Uses/qt.mk
+525-5252 files

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