Remove obsolete restriction on the range of log_rotation_size.

When syslogger.c was first written, we didn't want to assume that
all platforms have 64-bit ftello.  But we've been assuming that
since v13 (cf commit 799d22461), so let's use that in syslogger.c
and allow log_rotation_size to range up to INT_MAX kilobytes.

The old code effectively limited log_rotation_size to 2GB regardless
of platform.  While nobody's complained, that doesn't seem too far
away from what might be thought reasonable these days.

I noticed this while searching for instances of "1024L" in connection
with commit 041e8b95b.  These were the last such instances.
(We still have instances of L-suffixed literals, but most of them
are associated with wait intervals for pg_usleep or similar functions.
I don't see any urgent reason to change that.)

src/backend/postmaster/syslogger.c

@@ -444,19 +444,19 @@ SysLoggerMain(char *startup_data, size_t startup_data_len)
 		if (!rotation_requested && Log_RotationSize > 0 && !rotation_disabled)
 		{
 			/* Do a rotation if file is too big */
-			if (ftell(syslogFile) >= Log_RotationSize * 1024L)
+			if (ftello(syslogFile) >= Log_RotationSize * (pgoff_t) 1024)
 			{
 				rotation_requested = true;
 				size_rotation_for |= LOG_DESTINATION_STDERR;
 			}
 			if (csvlogFile != NULL &&
-				ftell(csvlogFile) >= Log_RotationSize * 1024L)
+				ftello(csvlogFile) >= Log_RotationSize * (pgoff_t) 1024)
 			{
 				rotation_requested = true;
 				size_rotation_for |= LOG_DESTINATION_CSVLOG;
 			}
 			if (jsonlogFile != NULL &&
-				ftell(jsonlogFile) >= Log_RotationSize * 1024L)
+				ftello(jsonlogFile) >= Log_RotationSize * (pgoff_t) 1024)
 			{
 				rotation_requested = true;
 				size_rotation_for |= LOG_DESTINATION_JSONLOG;
@@ -1183,9 +1183,11 @@ pipeThread(void *arg)
 		 */
 		if (Log_RotationSize > 0)
 		{
-			if (ftell(syslogFile) >= Log_RotationSize * 1024L ||
-				(csvlogFile != NULL && ftell(csvlogFile) >= Log_RotationSize * 1024L) ||
-				(jsonlogFile != NULL && ftell(jsonlogFile) >= Log_RotationSize * 1024L))
+			if (ftello(syslogFile) >= Log_RotationSize * (pgoff_t) 1024 ||
+				(csvlogFile != NULL &&
+				 ftello(csvlogFile) >= Log_RotationSize * (pgoff_t) 1024) ||
+				(jsonlogFile != NULL &&
+				 ftello(jsonlogFile) >= Log_RotationSize * (pgoff_t) 1024))
 				SetLatch(MyLatch);
 		}
 		LeaveCriticalSection(&sysloggerSection);

src/backend/utils/misc/guc_tables.c

@@ -3299,7 +3299,7 @@ struct config_int ConfigureNamesInt[] =
 			GUC_UNIT_KB
 		},
 		&Log_RotationSize,
-		10 * 1024, 0, INT_MAX / 1024,
+		10 * 1024, 0, INT_MAX,
 		NULL, NULL, NULL
 	},