Support more OS/2 APIRET codes to convert to errno

[dmik]

In particular, ERROR_TIMEOUT from Dos*Wait* functions (e.g. waiting on a mutex) is currently mapped to EINVAL which is completely misleading. The supplied patch maps it to ETIMEDOUT (this is originally for connections but this is also sorta connection request and I couldn't find anything better, EAGAIN is returned if the wait would block which is not the same as the timeout).