meson: Improve Qt examples

Qt dependencies have been moved to the main build file where the
rest of dependencies are located. This makes it easier to find them.

The included directories has also reviewed and removed the
unnecessary ones.

examples/C/qt/meson.build

@@ -4,18 +4,11 @@ examples = [
   ['change-ipv4-addresses', []],
 ]
 
-incs = [
-  top_inc,
-  libnm_core_inc,
-]
-
-qt_core_dep = dependency('QtCore', version: '>= 4')
-
 deps = [
   dbus_dep,
   qt_core_dep,
-  dependency('QtDBus'),
-  dependency('QtNetwork'),
+  qt_dbus_dep,
+  qt_network_dep,
 ]
 
 moc = find_program('moc-qt4', required: false)
@@ -39,7 +32,7 @@ foreach example: examples
   executable(
     example[0],
     example[0] + '.cpp',
-    include_directories: incs,
+    include_directories: libnm_core_inc,
     dependencies: deps,
     link_depends: example[1],
   )

meson.build

@@ -840,6 +840,11 @@ subdir('examples/C/glib')
 enable_qt = get_option('qt')
 if enable_qt
   add_languages('cpp')
+
+  qt_core_dep = dependency('QtCore', version: '>= 4')
+  qt_dbus_dep = dependency('QtDBus')
+  qt_network_dep = dependency('QtNetwork')
+
   subdir('examples/C/qt')
 endif