Adopt new o.e.e.p2.publisher.eclipse API for IMacOsBundleUrlType

After #4246, we can now consume the new

org.eclipse.equinox.internal.p2.publisher.eclipse.IProductDescriptor.getMacOsBundleUrlTypes()

API in the Tycho wrapper
org.eclipse.tycho.p2.tools.publisher.ExpandedProduct.

This is necessary to properly support link handler registrations in
product's launchers.

See
eclipse-platform/eclipse.platform.ui#1901
eclipse-equinox/p2#533
for more information.

tycho-core/src/main/java/org/eclipse/tycho/p2/tools/publisher/ExpandedProduct.java

@@ -27,6 +27,7 @@
 import org.eclipse.equinox.internal.p2.publisher.eclipse.ProductContentType;
 import org.eclipse.equinox.p2.metadata.IInstallableUnit;
 import org.eclipse.equinox.p2.metadata.IVersionedId;
+import org.eclipse.equinox.p2.publisher.eclipse.IMacOsBundleUrlType;
 import org.eclipse.equinox.p2.repository.IRepositoryReference;
 import org.eclipse.tycho.ArtifactType;
 import org.eclipse.tycho.Interpolator;
@@ -291,4 +292,9 @@ public String getVM(String os) {
         return defaults.getVM(os);
     }
 
+    @Override
+    public List<IMacOsBundleUrlType> getMacOsBundleUrlTypes() {
+        return defaults.getMacOsBundleUrlTypes();
+    }
+
 }