Clean pom file from duplicated maven-compiler-plugin section.

Author: vertigo17

source/pom.xml

@@ -966,14 +966,6 @@
                     <skip>true</skip>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <source>11</source>
-                    <target>11</target>
-                </configuration>
-            </plugin>
         </plugins>
     </build>