[PATCH] Portability issue on doc script and a fix on cfg.mk.

[Konstantinos Chasialis]

Hello once again! I am so glad to be back to HACKING Poke (or poke :)).

This patch contains the portability issue on that I faced during the build
phase on my macOS and a minor fix on cfg.mk where the *pk tests were not
found at all times causing the make syntax-check to report error.

Sadly, I became a little bit rusty with the whole patch supplying thing
because it's been a long time since I have not contributed to this
project.

I hope everything is ok with the patch.

Thanks.

0002-2021-03-17-Kostas-Chasialis-sdi1600195-di.uoa.gr.patch
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