ssize_t is used for some argument to indicate +/-delta. Because it depends on posix, let's replace the usage with ptrdiff_t which is standard.
Committed 263472@main (3fca1b37291f): <https://commits.webkit.org/263472@main> Reviewed commits have been landed. Closing PR #13243 and removing active labels.
<rdar://problem/108631611>