make library and plugin dependencies declarative

instead of directly including the respective pri files in
*_dependencies.pri, set variables and let qtcreator.pri resolve
them to includes.
this will allow us to re-use the dependency info elsewhere.

Change-Id: Iaa33924e428ac0409660f42df2f98a7978452d3e
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com>

src/plugins/qmlprofiler/qmlprofiler_dependencies.pri

@@ -1,8 +1,11 @@
-include(../../plugins/coreplugin/coreplugin.pri)
-include(../../plugins/analyzerbase/analyzerbase.pri)
-include(../../plugins/qmlprojectmanager/qmlprojectmanager.pri)
-include(../../plugins/qt4projectmanager/qt4projectmanager.pri)
-include(../../plugins/qmljstools/qmljstools.pri)
-include(../../plugins/remotelinux/remotelinux.pri)
-include(../../libs/qmldebug/qmldebug.pri)
-include(../../libs/extensionsystem/extensionsystem.pri)
+QTC_PLUGIN_NAME = QmlProfiler
+QTC_LIB_DEPENDS += \
+    qmldebug \
+    extensionsystem
+QTC_PLUGIN_DEPENDS += \
+    coreplugin \
+    analyzerbase \
+    qmlprojectmanager \
+    qt4projectmanager \
+    qmljstools \
+    remotelinux