QEMU build tweaks 1
Created originally on Bitbucket by daniel_fort (Daniel Fort)
Was already merged in Bitbucket before import, marked as merged by the import user
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Changed shebang in bash scripts. This should make them more portable. An issue came up because the Macintosh uses an older version of bash in /bin/bash and we want to use a newer Homebrew installed version in /user/local/bin/bash without breaking other setups.
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Suppress printing an error message if the command isn’t found.