Make import private

Author: smowton

java/ql/lib/semmle/code/java/security/RequestForgery.qll

@@ -7,7 +7,7 @@ import semmle.code.java.frameworks.spring.Spring
 import semmle.code.java.frameworks.JaxWS
 import semmle.code.java.frameworks.javase.Http
 import semmle.code.java.dataflow.DataFlow
-import semmle.code.java.dataflow.StringPrefixes
+private import semmle.code.java.dataflow.StringPrefixes
 private import semmle.code.java.dataflow.ExternalFlow
 
 /**