Link ole32 in WASAPI backend for COM symbols.

Fixes build on aarch64.  We must've been picking ole32 up implicitly on x86
platforms.

CMakeLists.txt

@@ -186,7 +186,7 @@ if(USE_WASAPI)
   target_sources(cubeb PRIVATE
     src/cubeb_wasapi.cpp)
   target_compile_definitions(cubeb PRIVATE USE_WASAPI)
-  target_link_libraries(cubeb PRIVATE avrt)
+  target_link_libraries(cubeb PRIVATE avrt ole32)
 endif()
 
 check_include_files("windows.h;mmsystem.h" USE_WINMM)