revert to the default implementaion.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@2926 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/scm/NullSCM.java

@@ -35,10 +35,6 @@ public class NullSCM extends SCM {
         return DESCRIPTOR;
     }
 
-    public void buildEnvVars(Map<String,String> env) {
-        // noop
-    }
-
     public ChangeLogParser createChangeLogParser() {
         return new NullChangeLogParser();
     }

core/src/main/java/hudson/scm/SubversionSCM.java

@@ -499,10 +499,6 @@ public class SubversionSCM extends SCM implements Serializable {
         return DescriptorImpl.DESCRIPTOR;
     }
 
-    public void buildEnvVars(Map<String,String> env) {
-        // no environment variable
-    }
-
     public FilePath getModuleRoot(FilePath workspace) {
         if (getLocations().length > 0)
             return workspace.child(getLocations()[0].local);