Default source file encoding is UTF-8

[Ludovic Courtès]

Hello!

I just changed ‘compile-file’ to assume the input file is UTF-8-encoded
unless a ‘coding:’ cookie is present.

Until now, it would default to the value of ‘%default-port-encoding’,
i.e., the current locale’s encoding.  Consequently, some files would
fail to compile if the locale encoding is ASCII, whereas they would
succeed with a UTF-8 locale (Hydra’s FreeBSD box happened to use an
ASCII locale.)

Thanks,
Ludo’.