Remove epoll dependency now that we not depend on it directly anymore (java-native-access#223)

Motivation:

With 91c90cb in we don't need a direct dependency on epoll anymore

Modifications:

Remove dependency

Result:

Cleanup

Author: normanmaurer

pom.xml

@@ -817,11 +817,6 @@
       <artifactId>netty-transport</artifactId>
       <version>${netty.version}</version>
     </dependency>
-    <dependency>
-      <groupId>io.netty</groupId>
-      <artifactId>netty-transport-native-epoll</artifactId>
-      <version>${netty.version}</version>
-    </dependency>
     <dependency>
       <groupId>io.netty</groupId>
       <artifactId>netty-transport-native-epoll</artifactId>