[releng] EMF 2.11 dependency introduced with latest Xtext
https://bugs.eclipse.org/bugs/show_bug.cgi?id=451668

Signed-off-by: Dennis Huebner <dennis.huebner@itemis.de>
[osgi] Mwe2 as an Xtext-lang needs a runtime dep to equinox.common
https://bugs.eclipse.org/bugs/show_bug.cgi?id=446253