remove non needed cast

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1331446 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java b/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
index 3d27c11..180ee16 100644
--- a/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
+++ b/src/main/java/org/apache/maven/plugin/AbstractCompilerMojo.java
@@ -451,8 +451,8 @@
             {
                 for ( Map.Entry<String, String> me : effectiveCompilerArguments.entrySet() )
                 {
-                    String key = (String) me.getKey();
-                    String value = (String) me.getValue();
+                    String key = me.getKey();
+                    String value = me.getValue();
                     if ( !key.startsWith( "-" ) )
                     {
                         key = "-" + key;