[Bug-apl] [Reproducible builds] add support for SOURCE_DATE_EPOCH

[Santiago Torres-Arias]

Hi,

I'm a member of the Arch Linux Security team working on the reproducible
builds initiative. Right now, apl compiles almost reproducibly, with the
only caveat of embedding some time-based information into a header file.
It would be nice if this could be overriden with an environment variable
(or stripped out whatsoever).

I'm attaching a patch on how I believe this could be achieved.

Thanks!
-Santiago.

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