in_winevtlog: change total_size_threshold to size_t (#8853)

The `total_size_threshold` field was originally an unsigned int. The
field in the config map uses `FLB_CONFIG_MAP_SIZE`, which reads the
value as a `size_t` and then writes it to the offset of the field in the
struct. On a 64-bit machine, this is 8 bytes. This means the 8 byte
value would be written at this offset, as a result overriding the value
of the next struct field. This would cause `string_inserts` with default
values to end up being `false` when it should be `true`.

This PR changes `total_size_threshold` to a `size_t`. This seems
consistent with other usages of `FLB_CONFIG_MAP_SIZE` that I was able to
find.

Signed-off-by: braydonk <[email protected]>

plugins/in_winevtlog/winevtlog.h

@@ -27,7 +27,7 @@
 struct winevtlog_config {
     unsigned int interval_sec;
     unsigned int interval_nsec;
-    unsigned int total_size_threshold;
+    size_t total_size_threshold;
     int string_inserts;
     int read_existing_events;
     int render_event_as_xml;