Remove java9+ maven profile

Since the baseline is now Java 11 in which
--illegal-access=permit is the default [1],
this profile is not necessary anymore.

[1]: https://docs.oracle.com/en/java/javase/11/tools/java.html#GUID-3B1CE181-CD30-4178-9602-230B800D4FAE__GUID-5D972434-DC15-4D1D-8473-56085896D5F2

Author: fmbenhassine

pom.xml

@@ -216,34 +216,4 @@
         </plugins>
     </build>
 
-    <profiles>
-        <profile>
-            <id>java9+</id>
-            <activation>
-                <jdk>[9,)</jdk>
-            </activation>
-            <build>
-                <plugins>
-                    <plugin>
-                        <groupId>org.apache.maven.plugins</groupId>
-                        <artifactId>maven-compiler-plugin</artifactId>
-                        <version>${maven-compiler-plugin.version}</version>
-                        <configuration>
-                            <verbose>true</verbose>
-                            <source>${java.version}</source>
-                            <target>${java.version}</target>
-                            <showWarnings>true</showWarnings>
-                            <fork>true</fork>
-                            <compilerArgs>
-                                <arg>-verbose</arg>
-                                <arg>-Xlint:unchecked</arg>
-                                <arg>-J--illegal-access=permit</arg>
-                            </compilerArgs>
-                        </configuration>
-                    </plugin>
-                </plugins>
-            </build>
-        </profile>
-    </profiles>
-
 </project>