contrib: qt: always add includedir to the .pc file
The generated .pc files do not contain -I${includedir}, only -I${includedir}/$QTMODULE. This is because QMake finds out that our standard contrib include path is already in the QMAKE_DEFAULT_INCDIRS list. When this includepath is not forced externally through some script and only the .pc file flags are used for the qt plugin, the build fails: In file included from /vlc/contrib/x86_64-linux-gnu/include/QtWidgets/QApplication:1, from ../modules/gui/qt/vlc-qt-check.cpp:26: /vlc/contrib/x86_64-linux-gnu/include/QtWidgets/qapplication.h:43:10: fatal error: QtWidgets/qtwidgetsglobal.h: No such file or directory 43 | #include <QtWidgets/qtwidgetsglobal.h> | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Fixes #27588.
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