Change in coreboot[master]: clang: Allow ANY_TOOLCHAIN for non-coreboot clang

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/21300 )

Change subject: clang: Allow ANY_TOOLCHAIN for non-coreboot clang
......................................................................

Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/14912/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/59633/ : SUCCESS