Revert "C++: Work around problems I can't seem to solve for access paths at sources and sinks."

This reverts commit 15f09e8.

Author: hvitved

cpp/ql/lib/semmle/code/cpp/dataflow/ExternalFlow.qll

@@ -953,10 +953,6 @@ private module Cached {
    */
   cached
   predicate sourceNode(DataFlow::Node node, string kind, string model) {
-    exists(SourceSinkInterpretationInput::InterpretNode n |
-      isSourceNode(n, kind, model) and n.asNode() = node
-    )
-    or
     node.(Nodes::FlowSummaryNode).isSource(kind, model)
   }
 

cpp/ql/lib/semmle/code/cpp/dataflow/internal/FlowSummaryImpl.qll

@@ -376,10 +376,7 @@ private class SourceModelCall extends Public::SourceElement instanceof Call {
   private string ext;
 
   SourceModelCall() {
-    exists(string output |
-      sourceModel(namespace, type, subtypes, name, signature, ext, output, _, _, _) and
-      output.matches("%" + Input::encodeContent(_, _) + "%")
-    ) and
+    sourceModel(namespace, type, subtypes, name, signature, ext, _, _, _, _) and
     this.getTarget() = interpretElement(namespace, type, subtypes, name, signature, ext)
   }