Including GWT's rebased dependencies inside gwt-servlet.jar

Changed Ant's build.xml for gwt-servlet.jar so to include a selection of
libraries rebased for specific use in GWT and that may be required
also on server side:
- sourcemaps is used by StackTraceDeobfuscator,
- streamhtmlparser is required for SafeHtml
- guava is needed by both.
- protobuf needed for sourcemaps and devmode.
(see also linked issue).

Bug: issue 8438
Change-Id: I73df9d03368785a3625c3a48ee989dc919738e83
1 file changed