[luatex] Allow piped input

Henri Menke henrimenke at gmail.com
Thu Jun 13 05:53:06 CEST 2019

Dear devs,

It would be great if LuaTeX accepted piped input.  Currently a command

    texlua <(echo 'print "Hello"')

fails with an error like "Script file /dev/fd/63 not found".  I have
attached a simple patch which would eliminate the failure.

Cheers, Henri
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