Print file open error information

[pabs3]

Should help diagnose the build failures in Debian.

Fixes: #327

[microsoft-github-policy-service]

@pabs3 please read the following Contributor License Agreement(CLA). If you agree with the CLA, please reply with the following information.

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[pabs3]

I do not agree with the CLA. I do not believe that these changes are copyrightable. If they are copyrightable, I am the copyright holder and I release these changes under the MIT license. In both cases it should be possible to merge the changes.

…

-- bye, pabs https://bonedaddy.net/pabs3/