Bug 435109 - with apt in the loop, anchored type may leak an unwrapped

+ retain the source folder to fix the build
diff --git a/plugins/org.eclipse.objectteams.otdt.apt/src/removed.txt b/plugins/org.eclipse.objectteams.otdt.apt/src/removed.txt
new file mode 100644
index 0000000..ee95fe8
--- /dev/null
+++ b/plugins/org.eclipse.objectteams.otdt.apt/src/removed.txt
@@ -0,0 +1 @@
+This plug-in no longer holds source code. Still we need to retain the source folder.
\ No newline at end of file