Stop using the old JSR250 annotation.

This will likely break a bunch of things because things further down the
line were depending on narya bringing in this jar.

tools/src/main/java/com/threerings/presents/tools/GenServiceTask.java

@@ -231,7 +231,7 @@ public class GenServiceTask extends InvocationTask
         // import things marshaller will always need
         imports.add(sdesc.service);
         imports.add(InvocationMarshaller.class);
-        imports.add("javax.annotation.Generated");
+        imports.add("javax.annotation.processing.Generated");
 
         // We only add a type parameter for the caller ClientObject type if the service has one
         if (sdesc.callerTypeSpecified) {
@@ -512,7 +512,7 @@ public class GenServiceTask extends InvocationTask
         // import superclass and service
         imports.add(InvocationProvider.class);
         imports.add(sdesc.service);
-        imports.add("javax.annotation.Generated");
+        imports.add("javax.annotation.processing.Generated");
 
         // any method that takes a listener may throw this
         if (sdesc.hasAnyListenerArgs()) {

tools/src/main/java/com/threerings/presents/tools/SourceFile.java

@@ -203,7 +203,7 @@ public class SourceFile
      */
     protected void addOrRemoveGeneratedImport (boolean add)
     {
-        final String IMPORT = "import javax.annotation.Generated;";
+        final String IMPORT = "import javax.annotation.processing.Generated;";
 
         int packageLine = -1;
         int importLine = -1;

tools/src/main/resources/com/threerings/presents/tools/dispatcher.tmpl

@@ -1,6 +1,6 @@
 package {{package}};
 
-import javax.annotation.Generated;
+import javax.annotation.processing.Generated;
 
 {{#imports}}
 import {{this}};