Python: Fix extractor/experimental tests

Author: tausbn

python/ql/test/experimental/library-tests/CallGraph/InlineCallGraphTest.ql

@@ -1,6 +1,7 @@
 import python
 import utils.test.InlineExpectationsTest
 private import semmle.python.dataflow.new.internal.DataFlowDispatch as TT
+private import LegacyPointsTo
 
 /** Holds when `call` is resolved to `callable` using points-to based call-graph. */
 predicate pointsToCallEdge(CallNode call, Function callable) {

python/ql/test/extractor-tests/double-import/ModuleNames.ql

@@ -1,4 +1,5 @@
 import python
+private import LegacyPointsTo
 
 from Container path, string name
 where exists(ModuleValue m | m.getPath() = path and m.getName() = name)

python/ql/test/extractor-tests/unicode_decoding/test.ql

@@ -1,4 +1,5 @@
 import python
+private import LegacyPointsTo
 
 from Object o, string s
 where