qcap: Make v4l_device_create() static.

dlls/qcap/v4l.c

@@ -401,7 +401,7 @@ static LONG CDECL v4l_device_get_caps_count(struct video_capture_device *device)
     return device->caps_count;
 }
 
-struct video_capture_device * CDECL v4l_device_create(USHORT index)
+static struct video_capture_device * CDECL v4l_device_create(USHORT index)
 {
     struct v4l2_frmsizeenum frmsize = {0};
     struct video_capture_device *device;