Change in coreboot[master]: lint-stable: Only check files tracked by git (ie source files) for +x

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Change subject: lint-stable: Only check files tracked by git (ie source files) for +x
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/15197/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/59943/ : SUCCESS