[XS] Change in flashrom[main]: Makefile: Fix version string for non-Git builds

[Anton Samsonov (Code Review)]

Attention is currently required from: Anastasia Klimchuk, Anton Samsonov, Thomas Heijligen.

Anton Samsonov has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/79152?usp=email )

Change subject: Makefile: Fix version string for non-Git builds
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Patch Set 6:

(1 comment)

Commit Message:

https://review.coreboot.org/c/flashrom/+/79152/comment/a8cacba5_0f9cb20b :
PS5, Line 7:  non-Git builds
> How do you get the repo without Git?

This patch applies to standalone source trees produced by GitHub snapshot (“Download ZIP” form of repo cloning), as well as `git archive`, and perhaps future releases.

In fact, meson.build already behaves as expected in both Git- and non-Git scenarios — I just mirrored this behavior to Makefile.