directsoundsrc: add missing -lole32

CLSIDFromString() requires ole32.dll.
See https://msdn.microsoft.com/en-us/library/windows/desktop/ms680589%28v=vs.85%29.aspx

CLSIDFromString() is introduced at
f9464ce3549c2b3948a582464631ba4f8dd0d5e7 .

https://bugzilla.gnome.org/show_bug.cgi?id=764523
1 file changed