Build error on illumos - undefined S_IRUSR S_IWUSR

Building 8.2.1 on illumos (a Solaris derivative) I see the following error:

worker/worker_sql_task_protocol.c: In function 'TaskFileDestReceiverStartup':
worker/worker_sql_task_protocol.c:166:24: error: 'S_IRUSR' undeclared (first use in this function)
const int fileMode = (S_IRUSR | S_IWUSR);
^
worker/worker_sql_task_protocol.c:166:24: note: each undeclared identifier is reported only once for each function it appears in
worker/worker_sql_task_protocol.c:166:34: error: 'S_IWUSR' undeclared (first use in this function)
const int fileMode = (S_IRUSR | S_IWUSR);

This looks similar to #1958, and is easily fixed by adding

#include

to src/backend/distributed/worker/worker_sql_task_protocol.c

Thanks.