Unify how Qt/KF build flags/libs are set

Unify the way that QT5_CFLAGS, QT5_LIBS, KF5_CFLAGS
and KF5_LIBS are set.

RepositoryExternal.mk has entries for "qt5" and "kf5",
and thus using the "qt5" and "kf5" externals sets
includes, cxxflags, defs and libs for gbuild as needed.

Use this mechanism consistently in all Makefiles
for qt5-/kf5-related libraries and executables
and drop setting flags and libs "manually".

(For several targets, like 'vcl/Library_vclplug_qt5',
flags were set both ways, i.e. they were set twice).

Change-Id: I246cffdb0bf40b7ba2d694f9b868c2b8e381aacc
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/122804
Tested-by: Jenkins
Reviewed-by: Michael Weghorn <m.weghorn@posteo.de>

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