bug#15260: cannot build in a directory with non-ascii characters

[Stefan Monnier]

>> So, it should be removed and replaced by calls to either
>> make_unibyte_string or make_multibyte_string.
> I presume you think the same about build_string, then.

Pretty much, except that I tend to think of build_string as only meant
for use on string constants, which are all ASCII, normally, so it
doesn't matter nearly as much.


        Stefan