[PATCH] build/prereq: merge ifndef IB block together

[Sven Roederer]

Am Mittwoch, 30. Dezember 2020, 05:23:41 CET schrieb Paul Spooren:
> Multiple prereq checks are only required within the build system but not
> for the ImageBuilder. These checks are excluded by using ifndef IB.
> 
> This commit merges the three ifndef IB blocks together.

Happy new year to all.

When I made the change to not check for gcc, g++ I was also thinking of using 
a common "ifndef" block.
I used atomic blocks, as I expect it's more straight-forward on later changes 
and more consistent (copy and paste) for other tools.


Best Sven