Added nxt_usts2str() to make C strings from nxt_str_t.

This function is identical to nxt_ustr2str(), except that it takes
a nxt_str_t structure as input, instead of a 'u_char *' and a size.

The documentation of the function:

/*
 * SYNOPSIS
 *      void nxt_usts2str(char dst[restrict .src->length+1],
 *                        const nxt_str_t *restrict src);
 *
 * ARGUMENTS
 *      dst     Pointer to the first byte of the destination buffer.
 *      src     Pointer to the source Unterminated STring Structure.
 *
 * DESCRIPTION
 *      Copy a string from the source nxt_str_t, which may be
 *      not-NUL-terminated, into a NUL-terminated string in the
 *      destination buffer.
 *
 * CAVEATS
 *      If the destination buffer is not wider than the source buffer
 *      at least by 1 byte, the behavior is undefined.
 *
 * EXAMPLES
 *      nxt_str_t  src = nxt_string("0123456789");
 *      char       dst[src.length + 1];
 *
 *      nxt_usts2str(dst, &src);
 *
 * SEE ALSO
 *      ustr2str(3), strlcpy(3), strscpy(9)
 */

Suggested-by: Andrew Clayton <a.clayton@nginx.com>
Signed-off-by: Alejandro Colomar <alx@nginx.com>

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