win_thread.c timed wait always return 0

[xingkaiyu]

hi~
I am using thread with wasm and wamr on windows. And I find that pthread_cond_timedwait always return 0 no matter timed out or realy success.
I think we can return the wait result in os_cond_wait_internal. I tryed it and it works ok.
Here is my patch.
win_thread-patch.zip

[wenyongh]

Yes, could you please help submit a PR to fix it? Thanks.

[xingkaiyu]

like this #994 ?