POM: Apply Flatten Maven Plugin.

Change-Id: Ia17df13f08958a322e7fb20467e1666cd55dbe2b
diff --git a/jgvariant-bom/pom.xml b/jgvariant-bom/pom.xml
index b7bd93f..df83f0d 100644
--- a/jgvariant-bom/pom.xml
+++ b/jgvariant-bom/pom.xml
@@ -42,4 +42,20 @@
     </dependencies>
   </dependencyManagement>
 
+  <build>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>flatten-maven-plugin</artifactId>
+        <configuration>
+          <flattenMode>bom</flattenMode>
+          <pomElements>
+            <properties>flatten</properties>
+            <distributionManagement>flatten</distributionManagement>
+          </pomElements>
+        </configuration>
+      </plugin>
+    </plugins>
+  </build>
+
 </project>