Fix maven.compiler.target reference.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1553334 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

pom.xml

@@ -309,7 +309,7 @@ limitations under the License.
         <artifactId>maven-pmd-plugin</artifactId>
         <version>3.0.1</version>
         <configuration>
-          <targetJdk>${maven.compile.target}</targetJdk>
+          <targetJdk>${maven.compiler.target}</targetJdk>
           <linkXref>true</linkXref>
           <rulesets>
             <ruleset>${basedir}/pmd.xml</ruleset>