Fix build error on x86_64 with non-binary shell #28
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Build fails on x86_64 with a non-binary shell (such as the excellent xonsh Python-based shell) because
$SHELLwouldn't give information about the userspace architecture (instead, I get/usr/bin/xonsh: Python script, UTF-8 Unicode text executable). I propose to simply check/bin/shinstead which is fairly guaranteed to be a binary.