Remove files from src.includes which aren't required in source build

This fixes warnings Eclipse raises for the removed entries in
build.properties.
See https://bugs.eclipse.org/bugs/show_bug.cgi?id=286808

Change-Id: I00a88c3847fc787fd8fe571942b51a7e4faf46fc
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>