Bug#772311: mew-beta-bin: bashism in /bin/sh script

[Tatsuya Kinoshita]

Control: forwarded 772311 https://github.com/kazu-yamamoto/Mew/pull/76
Control: forwarded 772312 https://github.com/kazu-yamamoto/Mew/pull/76
Control: tags 772311 + fixed-upstream
Control: tags 772312 + fixed-upstream

Will be fixed for "jessie"+1, "stretch".

Thanks,
--
Tatsuya Kinoshita

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