[libcoap-developers] Patch reference for libcoap-develop Cygwin support

[Xiamin Xu <xi...@gm...>]

Hi,

I am a software developer focus on IOT area. Due to project requirements, I
downloaded the libcoap-develop code from github and tried to make it on
Cygwin then I got this error:
 "Currently unsupported operating system 'x86_64-pc-cygwin' ".

So I made some patch to fix the error (as attached). As a result, the
example program run successfully on Cygwin environment, and here is my
environment information:

Computer: Windows 10 64 bit & CYGWIN_NT-10.0 x86_64
Cygwin: 3.1.5-1
OpenSSL: 1.1.1g
gcc:9.3.0

Please noted that this is just a temporally patch just for your reference,
you may need more investigation and modification to make libcoap-develop
suitable for Cygwin.

Thanks.
Simon