dist/tools/build_system_sanity_check: check BOARD set as ?= #12009
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Contribution description
Applications Makefile must not set 'BOARD =' unconditionally but
'BOARD ?='.
Also fix the two tests that were wrong.
Testing procedure
The check executes without error:
Without the fix it found the errors:
This also led to not honoring the board configuration from the environment in master:
And now fixed with this PR:
Issues/PRs references
Found while debugging #11477