The server sends a number of columns to the client.
 It uses a limited "fast" function for that instead of the
 general one. This fast function cannot send numbers larger 
 than 2 bytes. 
 This causes the client to expect smaller number of columns. 
 The client writes outside of the allocated memory buffer 
 as a result.
 Fixed the server to use the general function to send column
 count.
 Fixed the client to check the column count before writing
 column data. 


mysql-test/t/mysql_client.test:
  Bug #19216: Client crashes on long SELECT
   - test case
sql/protocol.cc:
  Bug #19216: Client crashes on long SELECT
   - renamed the function for bether comprehention
     and made it local
   - used the right (non-local) function to transfer 
     the column count in Protocol::send_fields
sql/protocol.h:
  Bug #19216: Client crashes on long SELECT
   - made optimized net_store_length local
sql-common/client.c:
  Bug #19216: Client crashes on long SELECT
   - fixed the client to check for older servers (without the fix).