Initial pgindent and pgperltidy run for v14.

Also "make reformat-dat-files".

The only change worthy of note is that pgindent messed up the formatting
of launcher.c's struct LogicalRepWorkerId, which led me to notice that
that struct wasn't used at all anymore, so I just took it out.

src/port/preadv.c

@@ -35,8 +35,8 @@ pg_preadv(int fd, const struct iovec *iov, int iovcnt, off_t offset)
 		return -1;
 	return readv(fd, iov, iovcnt);
 #else
-	ssize_t 	sum = 0;
-	ssize_t 	part;
+	ssize_t		sum = 0;
+	ssize_t		part;
 
 	for (int i = 0; i < iovcnt; ++i)
 	{