Fix the logical error of arm64 in build.sh

[leslieluyu]

fix the bug #48
it's a logical error,
should use Logical and (&&) instead of Logical or (||) between two negative condition:

if [[ "${MACHINE_TYPE}" != "aarch64" ]] && [[ "${MACHINE_TYPE}" != "arm64" ]]

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[punya]

@leslieluyu thanks for creating the issue. Unfortunately we are not able to merge PRs from outside contributors at the moment (this repository is a mirror of a Google-internal repo that's used for active development). We'll look into this problem as part of the larger topic of ARM64 support.