remove INCLUDEPATH *= $$PWD from plugin .pri files

the include statements are supposed to be written in a way that makes
this unnecessary.

Change-Id: Idf0860b4c594d88477bca4528c5e9d2a172530b4
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/analyzerbase/analyzerbase.pri

 include(analyzerbase_dependencies.pri)
 
-INCLUDEPATH *= $$PWD
 LIBS *= -l$$qtLibraryName(AnalyzerBase)

src/plugins/debugger/debugger.pri

 include(debugger_dependencies.pri)
 
-INCLUDEPATH *= $$PWD
 LIBS *= -l$$qtLibraryName(Debugger)

src/plugins/qmldesigner/qmldesigner.pri

 include(qmldesigner_dependencies.pri)
 include(designercore/designercore.pri)
 LIBS *= -l$$qtLibraryName(QmlDesigner)
-INCLUDEPATH *= $$PWD
 INCLUDEPATH *= $$PWD/components/componentcore
 INCLUDEPATH *= $$PWD/components/formeditor
 INCLUDEPATH *= $$PWD/components/itemlibrary

src/plugins/valgrind/valgrind.pri

 include(valgrind_dependencies.pri)
 
-INCLUDEPATH += $$PWD
 LIBS *= -l$$qtLibraryName(Valgrind)