[coreboot-gerrit] Change in coreboot[master]: crosgcc: Update to clang 6.0 & cmake 3.11.3

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Change subject: crosgcc: Update to clang 6.0 & cmake 3.11.3
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-toolchain/425/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/74368/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/28486/ : SUCCESS