Removing unjar of content.jar

This fix will remove the extracing of content.jar file and retain
existing content.jar and content.xml.xz

Fix #1912

eclipse.platform.releng.tychoeclipsebuilder/eclipse.platform.repository/pom.xml

@@ -57,27 +57,6 @@
           <includeAllSources>true</includeAllSources>
         </configuration>
       </plugin>
-      <plugin>
-        <artifactId>maven-antrun-plugin</artifactId>
-        <executions>
-          <execution>
-            <id>unpack-content-jar</id>
-            <phase>package</phase>
-            <configuration>
-              <target>
-                <unjar
-                  src="target/repository/content.jar"
-                  dest="target/repository" />
-                <delete file="target/repository/content.jar" />
-                <delete file="target/repository/content.xml.xz" />
-              </target>
-            </configuration>
-            <goals>
-              <goal>run</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>xml-maven-plugin</artifactId>