Merge pull request #10486 from erik-krogh/java-unqueryable

Java: Delete some unused code

java/ql/lib/semmle/code/java/security/regexp/NfaUtilsSpecific.qll

@@ -61,7 +61,7 @@ module RegExpFlags {
   /**
    * Gets the flags for `root`, or the empty string if `root` has no flags.
    */
-  string getFlags(RegExpTerm root) {
+  deprecated string getFlags(RegExpTerm root) {
     root.isRootTerm() and
     result = root.getLiteral().getFlags()
   }