Say hello to Android CMake support

Requirements:
 - NDKr19 or newer
 - Qt 5.12.1 or newer

QtCreator supports the following variables:
 - ANDROID_PACKAGE_SOURCE_DIR
 - ANDROID_EXTRA_LIBS

Be aware, that there is a lot of magic done on QtCreator side, and you
can't use only cmake to build an Android APK.

[ChangeLog][Android][CMake] Add Android support for CMake projects.

Change-Id: I1d351976ed56f424c2bc972f4ff7b5968147a2ed
Reviewed-by: hjk <hjk@qt.io>

src/plugins/qmakeprojectmanager/qmakenodes.cpp

@@ -288,6 +288,10 @@ QVariant QmakeProFileNode::data(Core::Id role) const
         res.removeDuplicates();
         return res;
     }
+
+    if (role == Android::Constants::AndroidTargets)
+        return {};
+
     QTC_CHECK(false);
     return {};
 }