Based on PR #1875: several size_t values (from strlen(), fread(),
list_t.len, struct addrinfo::ai_addrlen) were implicitly narrowed to
int/unsigned/socklen_t, which triggers MSVC C4267 warnings on x64
Windows builds. Adds explicit casts and widens a few parameter/local
types to size_t where that is the semantically correct type.
Excludes the original PR's mongoose-related mg_send() casts, and
drops two hunks (flex.c, honeywell_cm921.c) that no longer apply
since the affected code was refactored away since 2021.
Co-authored-by: obones <1314739+obones@users.noreply.github.com>
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