bug#23754: Guile doesn't show correct character while interpreting script file

[Ws Hu <exprosic@gmail.com>]

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Hi,

guile replaces non-ascii unicodes with question marks while interpreting
script file:

> $ cat test.scm
> (display "蛤")
> $ file test.scm
> test.scm: UTF-8 Unicode text
> $ guile test.scm
> ?


while it works fine in REPL mode:

> $ guile <<<'(display "蛤")'
> GNU Guile 2.0.11
> Copyright (C) 1995-2014 Free Software Foundation, Inc.
> Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
> This program is free software, and you are welcome to redistribute it
> under certain conditions; type `,show c' for details.
> Enter `,help' for help.
> 蛤


and I think it's not a problem of my locale configuration:

> $ locale
> LANG=en_US.UTF-8
> LC_CTYPE="en_US.UTF-8"
> LC_NUMERIC="en_US.UTF-8"
> LC_TIME="en_US.UTF-8"
> LC_COLLATE="en_US.UTF-8"
> LC_MONETARY="en_US.UTF-8"
> LC_MESSAGES="en_US.UTF-8"
> LC_PAPER="en_US.UTF-8"
> LC_NAME="en_US.UTF-8"
> LC_ADDRESS="en_US.UTF-8"
> LC_TELEPHONE="en_US.UTF-8"
> LC_MEASUREMENT="en_US.UTF-8"
> LC_IDENTIFICATION="en_US.UTF-8"
> LC_ALL=

because my terminal recognizes utf8 bytes:

> $ printf "\xe8\x9b\xa4"
> 蛤

where e8-9b-a4 is the utf8-encoded Chinese character "蛤"

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