Remove obsolete (read: !QPA) defines from QtDeclarative

Any code under a define that is not Q_WS_QPA is no longer defined on any platform. Should be removed.

List of instances:
./src/plugins/qmltooling/qmldbg_inspector/abstractviewinspector.cpp:1
./src/plugins/qmltooling/qmldbg_inspector/editor/zoomtool.cpp:1
./src/declarative/scenegraph/qsgcontext.cpp:1
./src/declarative/items/qsgtextedit.cpp:2
./src/declarative/items/qsgtext.cpp:4
./src/declarative/items/qsgtextinput.cpp:1
./src/declarative/util/qdeclarativepixmapcache.cpp:1
./src/declarative/util/qdeclarativesvgparser.cpp:1
./tests/auto/declarative/qsgitem/tst_qsgitem.cpp:1 (_X11 = ?:142)
./tests/auto/declarative/qsgtext/tst_qsgtext.cpp:3 (_X11 = ?:525,551)
./tests/auto/declarative/qsgflickable/tst_qsgflickable.cpp:1
./tests/auto/declarative/qdeclarativeapplication/tst_qdeclarativeapplication.cpp:1
./tests/auto/declarative/qjsengine/tst_qjsengine.cpp:1 (:929 test on WIN)
./tests/auto/declarative/qsgtextinput/tst_qsgtextinput.cpp:5 (_X11/QWS = ?:2399,2410,2423)
./tests/auto/declarative/qsgfocusscope/tst_qsgfocusscope.cpp:2 (_X11 = ?:324,423)
./tests/auto/declarative/qsgtextedit/tst_qsgtextedit.cpp:6 (_X11/QWS = ?:2222,2234,2249)
./tools/qmlscene/main.cpp:2
./tools/qmlviewer/loggerwidget.cpp:2
./tools/qmlviewer/texteditautoresizer_maemo5.h:1 rm
./tools/qmlviewer/main.cpp:3
./tools/qmlviewer/qdeclarativetester.cpp:2
./tools/qmlviewer/qmlruntime.cpp:17
./tools/qmlviewer/proxysettings.h:1
./tools/qmlviewer/proxysettings.cpp:1

Symbian defines

Maemo defines