Use portable shebang for all bash scripts
Refs #426 <https://github.com/Genymobile/scrcpy/pull/426> Refs #1716 <https://github.com/Genymobile/scrcpy/pull/1716>
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Refs #426 <https://github.com/Genymobile/scrcpy/pull/426> Refs #1716 <https://github.com/Genymobile/scrcpy/pull/1716>