Update string_utils' string_length to work with char* or wchar_t*, so that it
may be reusable when implementing wmemchr, wcspbrk, wcsrchr, wcsstr.
Link: #121183
Link: #124027
Co-authored-by: Nick Desaulniers <ndesaulniers@google.com>
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Co-authored-by: Tristan Ross <tristan.ross@midstall.com>
Summary:
This is a holdover from when these targets were merged. They're
basically the same but there's no reason they should be treated as
identical. I think we will live with a little duplication.