add src/shared/ to INCLUDEPATH

this is needed to make self-contained wrt the proparser dependency.

Change-Id: Ia9d0a7a3cfe0d7f022811559261bede42fa7c57a
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qtsupport/qtsupport_dependencies.pri

@@ -7,3 +7,4 @@ DEFINES *= \
     PROEVALUATOR_THREAD_SAFE \
     PROEVALUATOR_CUMULATIVE \
     PROEVALUATOR_SETENV
+INCLUDEPATH *= $$PWD/../../shared