[coreboot-gerrit] [XS] Change in coreboot[main]: [test] add some warnings to Makefile

[Elyes Haouas (Code Review)]

Elyes Haouas has abandoned this change. ( https://review.coreboot.org/c/coreboot/+/85596?usp=email )

Change subject: [test] add some warnings to Makefile
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Abandoned