Enhance test coverage for strnlen, wcsnlen
This commit adds string/test-strnlen-nonarray and
wcsmbs/test-wcsnlen-nonarray.
Reviewed-by: 
Noah Goldstein <goldstein.w.n@gmail.com>
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This commit adds string/test-strnlen-nonarray and
wcsmbs/test-wcsnlen-nonarray.
Reviewed-by: Noah Goldstein <goldstein.w.n@gmail.com>