Export some neglected classes in the tests

Signed-off-by: Dimitar Dobrev <dpldobrev@protonmail.com>

tests/CSharp/CSharp.h

@@ -893,7 +893,7 @@ TemplateWithDependentField<T>::TemplateWithDependentField()
 {
 }
 
-class DerivesFromTemplateInstantiation : public TemplateWithDependentField<int>
+class DLL_API DerivesFromTemplateInstantiation : public TemplateWithDependentField<int>
 {
 public:
     DerivesFromTemplateInstantiation();

tests/CSharp/CSharpTemplates.h

@@ -423,7 +423,7 @@ DerivesFromTemplateWithExplicitSpecialization<T, D>::~DerivesFromTemplateWithExp
 {
 }
 
-class DerivesFromExplicitSpecialization : public DerivesFromTemplateWithExplicitSpecialization<bool, bool>
+class DLL_API DerivesFromExplicitSpecialization : public DerivesFromTemplateWithExplicitSpecialization<bool, bool>
 {
 public:
     DerivesFromExplicitSpecialization();