Remove include of org.apache.xmlgraphics from org.eclipse.e4.rcp feature

- This is to avoid needing to touch the feature when this 3rd party
dependency is updated in the target platform.

Author: merks

features/org.eclipse.e4.rcp/feature.xml

@@ -76,10 +76,6 @@
          id="org.eclipse.e4.core.contexts"
          version="0.0.0"/>
 
-   <plugin
-         id="org.apache.xmlgraphics"
-         version="0.0.0"/>
-
    <plugin
          id="org.eclipse.e4.core.di.extensions"
          version="0.0.0"/>