os.zig: add ETIMEDOUT error case to read function

According to documentation ETIMEDOUT (110) is a valid error code for the read function.  I just had my long-running  (been running for about 7 weeks) network program crash because it did not handle the ETIMEDOUT error code from "read".
75b699b2c6Jonathan Marler committed on 5/4/2020, 5:48:34 PM· committed by Andrew Kelleyparent9b788b7
3 files changedLine totals unavailable