join: add support for -z option
#2880
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This was referenced Jan 16, 2022
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This gets the z1, z4, z5, and z6 GNU tests to pass (and doesn't make any additional tests fail, including the other z tests).
This code could very easily be extended to support other single-byte line endings (just add them to the enum, then expose them as options), but these are the only two GNU supports.
Related: #2634