[build] Use the Oxygen Recommended repo for Orbit

Change-Id: I549b01785832bc019c7e03e928b6579fec974b03
Signed-off-by: Pierre-Charles David <pierre-charles.david@obeo.fr>

org.eclipse.gmf.runtime.target/gmf-runtime.target

diff --git a/org.eclipse.gmf.runtime.target/gmf-runtime.target b/org.eclipse.gmf.runtime.target/gmf-runtime.target
index 523be49..309e9cb 100644
--- a/org.eclipse.gmf.runtime.target/gmf-runtime.target
+++ b/org.eclipse.gmf.runtime.target/gmf-runtime.target
@@ -61,7 +61,7 @@
 <unit id="org.hamcrest" version="1.1.0.v20090501071000"/>
 <unit id="org.hamcrest.text.source" version="1.1.0.v20090501071000"/>
 <unit id="org.hamcrest.text" version="1.1.0.v20090501071000"/>
-<repository location="http://download.eclipse.org/tools/orbit/downloads/drops/S20160916162009/repository/"/>
+<repository location="http://download.eclipse.org/tools/orbit/R-builds/R20170516192513/repository/"/>
 </location>
 <location includeAllPlatforms="false" includeConfigurePhase="true" includeMode="planner" includeSource="true" type="InstallableUnit">
 <unit id="org.eclipse.ocl.feature.group" version="3.6.0.v20160523-1914"/>