Compile fix for QmlObserver

The problem was that qtLibraryTarget only works for libraries (see
mkspecs/features/qt_functions.prf), not apps. Additionally,
because we now have an app bundle inside an app bundle for OS X, the
install name of the library has to be manually modified.

Reviewed-by: con

src/libs/qmljsdebugger/qmljsdebugger.pri

 INCLUDEPATH += $$PWD/include
 DEPENDPATH += $$PWD $$PWD/include $$PWD/editor
-QT += declarative
+QT += declarative script
 
 LIBS *= -l$$qtLibraryTarget(QmlJSDebugger)

src/tools/qml/qmlobserver/qmlobserver.pro

@@ -5,7 +5,14 @@ include(qml.pri)
 
 SOURCES += main.cpp 
 
+# hack to get qtLibraryTarget macro working
+TEMPLATE +=lib
 include(../../../libs/qmljsdebugger/qmljsdebugger.pri)
+mac {
+    libraryTarget = $$qtLibraryTarget(QmlJSDebugger)
+}
+TEMPLATE -=lib
+
 include(../../../../qtcreator.pri)
 include(../../../private_headers.pri)
 DESTDIR = $$IDE_BIN_PATH
@@ -15,6 +22,8 @@ mac {
     QMAKE_INFO_PLIST=Info_mac.plist
     TARGET=QMLObserver
     ICON=qml.icns
+    QMAKE_POST_LINK=install_name_tool -change @executable_path/../PlugIns/lib$${libraryTarget}.1.dylib @executable_path/../../../../PlugIns/lib$${libraryTarget}.1.dylib \'$$DESTDIR/$${TARGET}.app/Contents/MacOS/$$TARGET\'
 } else {
     TARGET=qmlobserver
 }
+