Follow up to r10350. Allow collapse-all-properties in .gwt.xml module files

Fixes issues: 5694

Review at http://gwt-code-reviews.appspot.com/1463806

Review by: rjrjr@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10470 8db76d5a-ed1c-0410-87a9-c151d255dfc7

distro-source/core/src/gwt-module.dtd

diff --git a/distro-source/core/src/gwt-module.dtd b/distro-source/core/src/gwt-module.dtd
index 6642774..0e32fe0 100644
--- a/distro-source/core/src/gwt-module.dtd
+++ b/distro-source/core/src/gwt-module.dtd
@@ -19,7 +19,7 @@
   define-property | extend-property | set-property | set-property-fallback |
   clear-configuration-property | define-configuration-property |
   extend-configuration-property | set-configuration-property |
-  property-provider | define-linker | add-linker)*>
+  property-provider | define-linker | add-linker | collapse-all-properties)*>
 <!ATTLIST module
 	rename-to CDATA #IMPLIED
 >