[coreboot-gerrit] Change in coreboot[master]: Makefile: Exclude util directory from project_filelist

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Change subject: Makefile: Exclude util directory from project_filelist
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/61124/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/16292/ : SUCCESS