Add org.eclipse.cdt.core.native to SDK setup file

Fixes eclipse-platform/eclipse.platform#1993

Author: iloveeclipse

releng/org.eclipse.ui.releng/platformUiTools.p2f

@@ -127,5 +127,10 @@
             <repository location='https://download.eclipse.org/eclipse/updates/I-builds'/>
         </repositories>
     </iu>
+    <iu id='org.eclipse.cdt.core.native' name='CDT native bits' version='0.0.0'>
+        <repositories size='1'>
+            <repository location='https://download.eclipse.org/tools/cdt/releases/latest/'/>
+        </repositories>
+    </iu>
   </ius>
 </p2f>