configure: change convention of passing libraries to config tests

instead of pre-resolving them and passing the final LIBS to qmake, pass
raw QMAKE_*_LIBS* assignments and a QMAKE_USE stanza. the immediate
benefit of that is that it centralizes the debug/release lib handling,
which makes build variant overrides available to all libraries, not just
a few selected ones.

note that this removes the CONFIG+=build_all from the test projects.
turns out that this was ineffective to start with, as config tests are
built with an explicit CONFIG-=debug_and_release. we might re-instate it
in a non-broken way later on.

Change-Id: I2117c5b36937e8230bd571dcee83231515cbe30b
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

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