[FS#866] The DownloadMethod/hg in include/download.mk seems to be broken

[LEDE Bugs]

The following task has a new comment added:

FS#866 - The DownloadMethod/hg in include/download.mk seems to be broken
User who did this - Jo-Philipp Wich (jow-)

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Can you provide the actual error you receive? Back when I implemented that change I explicitly tested whether GNU tar accepts epoch timestamp with fractional parts therefor I wanted to avoid the overhead of the extra `cut` call.

Your fix looks okay, I just like to understand the problem fully before applying it.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=866#comment2855