Replace ssize_t with ptrdiff_t
Replace ssize_t with ptrdiff_t

ssize_t is only specified by posix, and is unsupported by MSVC.
Instead, use ptrdiff_t.

jibsen/squash,quixdb/squash,quixdb/squash,jibsen/squash,quixdb/squash,Cloudef/squash,Cloudef/squash,jibsen/squash,Cloudef/squash