Work around Go error for unused module import

sethrj · sethrj · commit 2002f9777b3c · 2019-10-30T13:02:19.000-04:00
```
imported and not used: "swigtests/multi_import_d""
```
diff --git a/Examples/test-suite/multi_import_a.i b/Examples/test-suite/multi_import_a.i
@@ -2,7 +2,9 @@
 
 %module multi_import_a
 
+#ifndef SWIGGO
 %import multi_import_d.i
+#endif
 %import "multi_import_b.i"
 
 %{
diff --git a/Examples/test-suite/multi_import_c.i b/Examples/test-suite/multi_import_c.i
@@ -1,4 +1,6 @@
+#ifndef SWIGGO
 %import "multi_import_d.i"
+#endif
 
 class XXX
 {
