[SDK] wine/test.h: Centralize oleauto.h inclusion to address undefined reference to wine_dbgstr_variant even in modules that don't have automatic test discovery (no testlist.c file). CORE-20606

sdk/include/wine/test.h

@@ -579,6 +579,9 @@ static inline void winetest_add_failures( LONG new_failures )
 
 #include <stdio.h>
 #include <excpt.h>
+#ifdef __REACTOS__
+#include <oleauto.h>
+#endif
 
 struct test
 {