Add stub implementations for isUnreachableInCall()

Author: hvitved

cpp/ql/src/semmle/code/cpp/dataflow/internal/DataFlowPrivate.qll

@@ -264,3 +264,5 @@ class DataFlowCall extends Expr {
   /** Gets the enclosing callable of this call. */
   Function getEnclosingCallable() { result = this.getEnclosingFunction() }
 }
+
+predicate isUnreachableInCall(Node n, DataFlowCall call) { none() } // stub implementation

cpp/ql/src/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll

@@ -204,3 +204,5 @@ class DataFlowCall extends CallInstruction {
 
   Function getEnclosingCallable() { result = this.getEnclosingFunction() }
 }
+
+predicate isUnreachableInCall(Node n, DataFlowCall call) { none() } // stub implementation

csharp/ql/src/semmle/code/csharp/dataflow/internal/DataFlowPrivate.qll

@@ -1357,3 +1357,5 @@ class DataFlowExpr = DotNet::Expr;
 class DataFlowType = DotNet::Type;
 
 class DataFlowLocation = Location;
+
+predicate isUnreachableInCall(Node n, DataFlowCall call) { none() } // stub implementation