[tz] New leapseconds.awk doesn't work on macOS

[Paul Eggert]

On 1/10/20 7:32 PM, Deborah Goldsmith via tz wrote:

> It turns out that having a regex in RS is a gawk feature and is not supported in Darwin awk.

Thanks for reporting the problem. I installed the attached patch to fix this 
portability bug.
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