bug 452716: add about.html to all plug-ins

Signed-off-by: Florian Thienel <florian@thienel.org>
diff --git a/org.eclipse.vex.projectplan/build.properties b/org.eclipse.vex.projectplan/build.properties
index eeb291d..0cbaabf 100644
--- a/org.eclipse.vex.projectplan/build.properties
+++ b/org.eclipse.vex.projectplan/build.properties
@@ -3,4 +3,6 @@
                plugin.xml,\

                styles/,\

                xsd/,\

-               plugin.properties

+               plugin.properties,\

+               about.html

+src.includes = about.html