[coreboot-gerrit] Change in coreboot[master]: xcompile: Step closer to clang && !gcc builds

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Change subject: xcompile: Step closer to clang && !gcc builds
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/15023/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/59751/ : SUCCESS