CoInitializeEx: use COINIT_APARTMENTTHREADED

PortAudio/ASIO drivers seem refuse initialization if
CoInitilizeEx initialized as COINIT_MULTITHREADED but they do for
COINIT_APARTMENTTHREADED.

Windows devices that could be affected by this change tested and seem
to work, namely:
- DeckLink
- DirectShow
- WASAPI

refer to GH-430

Author: MartinPulec

src/utils/windows.c

@@ -74,7 +74,7 @@ bool com_initialize(bool *com_initialized, const char *err_prefix)
         }
         *com_initialized = false;
         // Initialize COM on this thread
-        HRESULT result = CoInitializeEx(NULL, COINIT_MULTITHREADED);
+        HRESULT result = CoInitializeEx(NULL, COINIT_APARTMENTTHREADED);
         if (SUCCEEDED(result)) {
                 *com_initialized = true;
                 return true;