Add overlay[loca] in 4 more tests

Author: owen-mc

go/ql/test/library-tests/semmle/go/dataflow/ExternalFlowInheritance/ql_I1.ql

@@ -34,6 +34,7 @@ module FlowTest implements TestSig {
   }
 }
 
+overlay[local]
 class MyStep extends DataFlow::FunctionModel, Method {
   MyStep() { this.hasQualifiedName("github.com/nonexistent/test", "I1", "Step") }
 

go/ql/test/library-tests/semmle/go/dataflow/ExternalFlowInheritance/ql_P1.ql

@@ -44,6 +44,7 @@ module FlowTest implements TestSig {
   }
 }
 
+overlay[local]
 class MyStep extends DataFlow::FunctionModel, Method {
   MyStep() { this.hasQualifiedName("github.com/nonexistent/test", "P1", "Step") }
 

go/ql/test/library-tests/semmle/go/dataflow/ExternalFlowInheritance/ql_S1.ql

@@ -44,6 +44,7 @@ module FlowTest implements TestSig {
   }
 }
 
+overlay[local]
 class MyStep extends DataFlow::FunctionModel, Method {
   MyStep() { this.hasQualifiedName("github.com/nonexistent/test", "S1", "Step") }
 

go/ql/test/library-tests/semmle/go/dataflow/VarArgsWithFunctionModels/Flows.ql

@@ -4,6 +4,7 @@ import ModelValidation
 import utils.test.InlineFlowTest
 import DefaultFlowTest
 
+overlay[local]
 class SummaryModelTest extends DataFlow::FunctionModel {
   FunctionInput inp;
   FunctionOutput outp;