Bug 391987 - Add tycho.scmUrl for eclipse.platform.git

Added git repo URL to support Eclipse-SourceReferences
diff --git a/pom.xml b/pom.xml
index e4cd72d..120a447 100644
--- a/pom.xml
+++ b/pom.xml
@@ -27,6 +27,10 @@
   <version>3.8.0-SNAPSHOT</version>
   <packaging>pom</packaging>
 
+   <properties>
+     <tycho.scmUrl>scm:git:git://git.eclipse.org/gitroot/platform/eclipse.platform.git</tycho.scmUrl>
+   </properties>
+
   <modules>
     <module>update/org.eclipse.update.configurator</module>
     <module>update/org.eclipse.update.core</module>