Make doesn't fail when sha256sum is missing
stellar-core is the reference implementation for the peer to peer agent that manages the Stellar network
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Originally created by: sisuresh
When we build with Soroban enabled on Mac OS, this line will do nothing if sha256sum is not installed. The issue is that make will just continue, and we'll see an xdr mismatch later. We should get make to fail on that line. I tried set -eo pipeline, which fails if sha256sum is missing, but if sha256sum is there, the bash script ends on that line and the generated file is missing the braces echoed after that line.