Exclude launcher files explicitly

If only Project*.java is used, it discards even Project.java, which results in 'not found' in PythonActivity.java and stops compilation. Same thing will happen if you try to separate it to a package (org.kivy.launcher), but with more pain while trying to fix it.

Author: KeyWeeUsr

pythonforandroid/bootstraps/sdl2/build/templates/custom_rules.tmpl.xml

@@ -6,7 +6,8 @@
             <fileset dir="src" includes="**" />
             {% else %}
             <fileset dir="src">
-                <exclude name="org/kivy/android/Project*.java" />
+                <exclude name="org/kivy/android/ProjectAdapter.java" />
+                <exclude name="org/kivy/android/ProjectChooser.java" />
             </fileset>
             {% endif %}
             {% for dir, includes in args.extra_source_dirs %}