Create packaging/target via maven instead of manually

.travis.yml

@@ -22,7 +22,6 @@ before_install:
   - psql -c 'CREATE DATABASE test_db;' -U postgres
   - psql -U postgres test_db < extensions/database/tests/conf/travis-pgsql.sql
   - cp extensions/database/tests/conf/travis_tests.xml extensions/database/tests/conf/tests.xml
-  - mkdir packaging/target
   - mvn process-resources
 
 script:

appveyor.yml

@@ -35,7 +35,6 @@ before_test:
     SET PGUSER=postgres
     createdb test_db
     psql -U postgres test_db < extensions\database\tests\conf\travis-pgsql.sql
-    mkdir packaging\target
 
     copy extensions\database\tests\conf\appveyor_tests.xml extensions\database\tests\conf\tests.xml
 - cmd: |-

packaging/pom.xml

@@ -22,6 +22,26 @@
 
   <build>
     <plugins>
+      <plugin> <!-- necessary for launch4j -->
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>1.4</version>
+        <executions>
+          <execution>
+            <phase>generate-test-resources</phase>
+            <configuration>
+
+              <tasks>
+                <mkdir dir="./target/"/>
+              </tasks>
+
+            </configuration>
+            <goals>
+              <goal>run</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
       <plugin>
         <groupId>com.akathist.maven.plugins.launch4j</groupId>
         <artifactId>launch4j-maven-plugin</artifactId>