configure: favor qmake from contribs when using qt.conf from contribs
qmake doesn't provide the proper contrib QT_VERSION when using a -qtconf. It provides the version it was compiled with (!). So we use the one from contribs if possible.
qmake doesn't provide the proper contrib QT_VERSION when using a -qtconf. It provides the version it was compiled with (!). So we use the one from contribs if possible.
VideoLAN code repository instance