Guile's nftw and utf-8 encoding

[ashraz]

@mirkoh

Thanks to @ashraz, the use of the strace command on guile --version allowed me to debug this issue.

For a second, I was a bit confused because I couldn’t remember helping you on that issue, but I guess you used the solution/strace command from the following thread:

• GNU Guile warning: failed to install locale - #2 by ashraz (strace)
• GNU Guile warning: failed to install locale - #5 by ashraz (environment variable).