Revert "remove extra variable"

This reverts commit a9e8d51.

Author: elharo

impl/maven-impl/src/main/java/org/apache/maven/impl/model/DefaultInterpolator.java

@@ -263,9 +263,10 @@ private static String doSubstVars(
         // Using the start and stop delimiter indices, extract
         // the first, deepest nested variable placeholder.
         String variable = val.substring(startDelim + DELIM_START.length(), stopDelim);
+        String org = variable;
 
         String substValue = processSubstitution(
-                variable, cycleMap, configProps, callback, postprocessor, defaultsToEmptyString);
+                variable, org, cycleMap, configProps, callback, postprocessor, defaultsToEmptyString);
 
         // Append the leading characters, the substituted value of
         // the variable, and the trailing characters to get the new
@@ -284,6 +285,7 @@ private static String doSubstVars(
 
     private static String processSubstitution(
             String variable,
+            String org,
             Set<String> cycleMap,
             Map<String, String> configProps,
             UnaryOperator<String> callback,
@@ -326,7 +328,7 @@ private static String processSubstitution(
 
             // Process the operator value through substitution if it contains variables
             String processedOpValue =
-                    doSubstVars(opValue, variable, cycleMap, configProps, callback, postprocessor, defaultsToEmptyString);
+                    doSubstVars(opValue, org, cycleMap, configProps, callback, postprocessor, defaultsToEmptyString);
 
             // Apply the operator
             if (":+".equals(op)) {