[coreboot-gerrit] Change in coreboot[master]: tianocore: fix Makefile to be able to build a custom revision or branch

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Change subject: tianocore: fix Makefile to be able to build a custom revision or branch
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/19751/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/64994/ : SUCCESS