Swift: do not extract unresolved things from IfConfigDecl

This avoids extracting things that are unresolved within an
`IfConfigDecl` instance:
* all conditions
* all inactive code blocks
This is meant to test out the hypothesis that this should solve some
extractor issues. If going through with it we should definitely change
the schema model for this.

Also, tests have not been updated and are expected to fail.

Author: redsun82

swift/extractor/visitors/DeclVisitor.cpp

@@ -380,13 +380,16 @@ void DeclVisitor::fillAbstractStorageDecl(const swift::AbstractStorageDecl& decl
 
 codeql::IfConfigDecl DeclVisitor::translateIfConfigDecl(const swift::IfConfigDecl& decl) {
   auto entry = createEntry(decl);
-  entry.clauses = dispatcher_.fetchRepeatedLabels(decl.getClauses());
+  //  entry.clauses = dispatcher_.fetchRepeatedLabels(decl.getClauses());
+  if (auto activeClause = decl.getActiveClause()) {
+    entry.clauses.push_back(dispatcher_.fetchLabel(activeClause));
+  }
   return entry;
 }
 
 codeql::IfConfigClause DeclVisitor::translateIfConfigClause(const swift::IfConfigClause& clause) {
   auto entry = dispatcher_.createEntry(clause);
-  entry.condition = dispatcher_.fetchOptionalLabel(clause.Cond);
+  //  entry.condition = dispatcher_.fetchOptionalLabel(clause.Cond);
   entry.elements = dispatcher_.fetchRepeatedLabels(clause.Elements);
   entry.is_active = clause.isActive;
   return entry;