use centralized handling of QT_BUILD_PARTS

Change-Id: I01b834ce37b2b5053c2e468ef1e088cead5702cf
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>

qtsvg.pro

-TEMPLATE = subdirs
-
-module_qtsvg_src.subdir = src
-module_qtsvg_src.target = module-qtsvg-src
-
-module_qtsvg_examples.subdir = examples
-module_qtsvg_examples.target = module-qtsvg-examples
-module_qtsvg_examples.depends = module_qtsvg_src
-!contains(QT_BUILD_PARTS,examples) {
-    module_qtsvg_examples.CONFIG += no_default_install no_default_target
-}
-
-module_qtsvg_tests.subdir = tests
-module_qtsvg_tests.target = module-qtsvg-tests
-module_qtsvg_tests.depends = module_qtsvg_src
-module_qtsvg_tests.CONFIG = no_default_install
-!contains(QT_BUILD_PARTS,tests):module_qtsvg_tests.CONFIG += no_default_target
-
-SUBDIRS += module_qtsvg_src \
-           module_qtsvg_examples \
-           module_qtsvg_tests \
-
+load(qt_parts)