add missin source directives for doc plugins

Signed-off-by: nickboldt <nboldt@redhat.com>
diff --git a/plugins/docs/org.eclipse.datatools.oda.cshelp/build.properties b/plugins/docs/org.eclipse.datatools.oda.cshelp/build.properties
index b2dbd45..5917388 100644
--- a/plugins/docs/org.eclipse.datatools.oda.cshelp/build.properties
+++ b/plugins/docs/org.eclipse.datatools.oda.cshelp/build.properties
@@ -7,4 +7,7 @@
                about.ini,\
                about.mappings,\
                about.properties
-src.includes = about.html
+source.. = src/
+output.. = bin/
+src.includes = *
+src.excludes = src