zstd/zstd-1.4.0-1-x86_64.pkg.tar.xz build reproducible in our test framework:
a9595462f51136255fa33fbbb3042dc18b747c3263da7fe8772023303bd8a21a zstd-1.4.0-1-x86_64.pkg.tar.xz
da6419f053720dd388acee960a8d1ae09b1505b421cf9edb44f0efd44b73c1f4 zstd-1.4.0-1-x86_64.pkg.tar.xz-b1.BUILDINFO.txt
da6419f053720dd388acee960a8d1ae09b1505b421cf9edb44f0efd44b73c1f4 zstd-1.4.0-1-x86_64.pkg.tar.xz-b2.BUILDINFO.txt