Bug 391988 - Add tycho.scmUrl for eclipse.platform.common.git

Added git repo URL to support Eclipse-SourceReferences

pom.xml

diff --git a/pom.xml b/pom.xml
index 558da16..5e3d7ef 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.common.git</tycho.scmUrl>
+   </properties>
+
   <modules>
     <module>bundles/org.eclipse.jdt.doc.isv</module>
     <module>bundles/org.eclipse.jdt.doc.user</module>