Merge pull request #4565 from taosdata/fix/TD-2340

[TD-2340]<fix>: reserve field uint32_t crc for checksums

src/inc/taosmsg.h

@@ -200,6 +200,7 @@ typedef struct {
 
 typedef struct SMsgVersion {
   char     clientVersion[TSDB_VERSION_LEN];
+  uint32_t crc;
 } SMsgVersion;
 
 typedef struct SMsgHead {