bug#22420: Zsh test failure

[Leo Famulari]

On Thu, Jan 21, 2016 at 05:20:18PM -0500, Leo Famulari wrote:
> I patched the shebangs in "Test/ztst.zsh" and "Test/runtests.zsh" to use
> the 'zsh' produced by the build phase, but it doesn't seem to have made
> any difference.

I realized that the test suite sets 'ZTST_exe=../Src/zsh' and generally
takes care to execute Zsh scripts using that interpreter.

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