[coreboot-gerrit] Change in coreboot[master]: payloads/external/GRUB2: Build only for supported architectures

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/23171 )

Change subject: payloads/external/GRUB2: Build only for supported architectures
......................................................................

Patch Set 6:

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/67335/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/21880/ : SUCCESS