use centralized handling of QT_BUILD_PARTS

Change-Id: I14f08527a0b3a1bd58f815d28ebb4f38094d3bb7
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

qtdeclarative.pro

-TEMPLATE = subdirs
-
-module_qtdeclarative_src.subdir = src
-module_qtdeclarative_src.target = module-qtdeclarative-src
-
-module_qtdeclarative_tools.subdir = tools
-module_qtdeclarative_tools.target = module-qtdeclarative-tools
-module_qtdeclarative_tools.depends = module_qtdeclarative_src
-
-module_qtdeclarative_examples.subdir = examples
-module_qtdeclarative_examples.target = module-qtdeclarative-examples
-module_qtdeclarative_examples.depends = module_qtdeclarative_src
-!contains(QT_BUILD_PARTS,examples) {
-    module_qtdeclarative_examples.CONFIG = no_default_target no_default_install
-}
-
-module_qtdeclarative_tests.subdir = tests
-module_qtdeclarative_tests.target = module-qtdeclarative-tests
-module_qtdeclarative_tests.depends = module_qtdeclarative_src
-module_qtdeclarative_tests.CONFIG = no_default_install
-!contains(QT_BUILD_PARTS,tests):module_qtdeclarative_tests.CONFIG += no_default_target
-
-SUBDIRS += module_qtdeclarative_src \
-           module_qtdeclarative_tools \
-           module_qtdeclarative_examples \
-           module_qtdeclarative_tests \
+load(qt_parts)
 
 include(doc/config/qtdeclarative_doc.pri)