Second attempt failed due to $_ not being standard and as such it's
interpretation by certain shells when they were symlinked to /bin/sh
and invoked as such led to unpredictable results. So instead of trying
to be clever just use /bin/sh directly (That's what direct execution
would have led to anyway)

Hopefully this time nothing will break (Mingw?)

Thanks to Jordan Justen for report and analysis.
[Previous attempt (THISSHELL one) deserves a credit but reporter is
 too humble]
Signed-off-by: Nmalc <av1474@comtv.ru>