releng: fix unknown extended header keyword 'LIBARCHIVE.creationtime'

This warning shows when extracting the RCP on Linux because GNU tar
doesn't support that attribute.

The creating time is part of the tarfile name.

Signed-off-by: Bernd Hufmann <bernd.hufmann@ericsson.com>

Author: bhufmann

rcp/org.eclipse.tracecompass.rcp.product/pom.xml

@@ -58,6 +58,7 @@
                                 <solaris>zip</solaris>
                                 <win32>zip</win32>
                             </formats>
+                            <storeCreationTime>false</storeCreationTime>
                         </configuration>
                     </execution>
                 </executions>