#995106 fracplanet FTCBFS: does not pass cross flags to qmake

#995106#5
Date:
2021-09-26 10:00:45 UTC
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To:
The -6 upload of fracplanet regressed cross building, because it changed
the configuration step (without documenting it in d/changelog). The
dh_auto_configure invocation that happened to work was replaced with a
manual ./configure invocation that has no clue about cross building.
Reverting this change makes fracplanet cross buildable again.

Helmut