Compatibility with gawk-5

[ferki]

When using the recently been released gawk-5.0.0, the test suite seems to fail when asserting gawk version to match ^4. (as reported for example in Gentoo bug 684048).

A quick and simple check of functionality with gawk-5.0.0 installed seems to indicate everything is still OK (at least with using Google translate). The test also passes except for the GawkVersion test mentioned above.

I'm opening this issue to learn how it is best to go forward in this regard. Would you prefer updating the test suite to also allow gawk-5, or would it be best to keep the dependency tied to gawk-4 on the packaging side?

[soimort]

Thanks for the report. They haven't packaged gawk 5.0.0 for Arch yet, so the test suite still ran fine on my side so far.

Except for #285, it seems gawk 5 is mostly backward compatible with its version 4. But I think I'll give it a try for a few extra days to make sure it breaks nothing. Then I'll mark it as gawk 5-ready.

        assertTrue(GawkVersion ~ "^(4|5).")