Remove obsolete packaging format in the p2-director-plugin

The "tar.gz" archive format for Windows was only needed for RCPTT. With
migrating to SWTBot, the default settings can be used.

pom.xml

@@ -160,29 +160,6 @@
 					<groupId>org.eclipse.tycho</groupId>
 					<artifactId>tycho-p2-director-plugin</artifactId>
 					<version>${tycho-version}</version>
-					<executions>
-						<execution>
-							<id>materialize-products</id>
-							<goals>
-								<goal>materialize-products</goal>
-							</goals>
-							<phase>package</phase>
-						</execution>
-						<execution>
-							<id>archive-products</id>
-							<goals>
-								<goal>archive-products</goal>
-							</goals>
-							<phase>verify</phase>
-							<configuration>
-								<formats>
-									<linux>tar.gz</linux>
-									<macosx>tar.gz</macosx>
-									<win32>tar.gz</win32>
-								</formats>
-							</configuration>
-						</execution>
-					</executions>
 				</plugin>
 				<plugin>
 					<groupId>org.eclipse.tycho</groupId>