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[libcxx][CI] Work around Arm buildkite failures

Authored by DavidSpickett on Jul 9 2021, 12:29 PM.

Description

[libcxx][CI] Work around Arm buildkite failures

For reasons unknown, the build is now using compilers
from /usr/bin instead of /usr/local/bin which is where
we have our clang-12 aliases placed.

Reviewed By: #libc, ldionne

Differential Revision: https://reviews.llvm.org/D105704