Add schema to remote.core plug-in build.

Change-Id: Icf77b7614f7188de4565c94231e8b31beb41a0ae
diff --git a/bundles/org.eclipse.remote.core/build.properties b/bundles/org.eclipse.remote.core/build.properties
index b7235eb..8ca7dfd 100644
--- a/bundles/org.eclipse.remote.core/build.properties
+++ b/bundles/org.eclipse.remote.core/build.properties
@@ -8,4 +8,5 @@
                about.ini,\
                about.mappings,\
                about.properties,\
-               ptp_logo_icon32.png
+               ptp_logo_icon32.png,\
+               schema/