Remove definitions of deprecated variable 'mysql-client_found_rows'

include/MySQL_Thread.h

@@ -499,7 +499,6 @@ class MySQL_Threads_Handler
 		bool default_reconnect;
 		bool have_compress;
 		bool have_ssl;
-		bool client_found_rows;
 		bool multiplexing;
 //		bool stmt_multiplexing;
 		bool log_unhealthy_connections;

include/proxysql_structs.h

@@ -801,7 +801,6 @@ __thread int mysql_thread___poll_timeout_on_failure;
 __thread bool mysql_thread___connection_warming;
 __thread bool mysql_thread___have_compress;
 __thread bool mysql_thread___have_ssl;
-__thread bool mysql_thread___client_found_rows;
 __thread bool mysql_thread___multiplexing;
 __thread bool mysql_thread___log_unhealthy_connections;
 __thread bool mysql_thread___enforce_autocommit_on_reads;
@@ -961,7 +960,6 @@ extern __thread int mysql_thread___poll_timeout_on_failure;
 extern __thread bool mysql_thread___connection_warming;
 extern __thread bool mysql_thread___have_compress;
 extern __thread bool mysql_thread___have_ssl;
-extern __thread bool mysql_thread___client_found_rows;
 extern __thread bool mysql_thread___multiplexing;
 extern __thread bool mysql_thread___log_unhealthy_connections;
 extern __thread bool mysql_thread___enforce_autocommit_on_reads;