fix noisy warnings in header files

CMakeLists.txt

@@ -364,7 +364,6 @@ ADD_SUBDIRECTORY(extra/libevent)
 ADD_SUBDIRECTORY(extra)
 ADD_SUBDIRECTORY(sql)
 ADD_SUBDIRECTORY(client)
-ADD_SUBDIRECTORY(server-tools/instance-manager)
 ADD_SUBDIRECTORY(libmysql)
 ADD_SUBDIRECTORY(libservices)
 ADD_SUBDIRECTORY(tests)

sql/sql_class.h

@@ -679,7 +679,7 @@ class Statement: public ilink, public Query_arena
   Server_side_cursor *cursor;
 
   inline char *query() { return query_string.str; }
-  inline uint32 query_length() { return query_string.length; }
+  inline uint32 query_length() { return (uint32)query_string.length; }
   void set_query_inner(char *query_arg, uint32 query_length_arg);
 
   /**

sql/sql_string.h

@@ -376,7 +376,7 @@ class String
 
   void qs_append(const char *str)
   {
-    qs_append(str, strlen(str));
+    qs_append(str, (uint32)strlen(str));
   }
   void qs_append(const char *str, uint32 len);
   void qs_append(double d);