mysqli: use native api

Tested with:
* mysql-5.6.49-linux-glibc2.12-x86_64
* mysql-5.7.31-linux-glibc2.12-x86_64
* mysql-8.0.21-linux-glibc2.17-x86_64
* mariadb-10.5.6

configure --with-mysqli=/usr/local/$version/bin/mysql_config   --with-pdo-mysql=/usr/local/$version

MySQL-8.0 removed my_bool
Some options where deprecated in mysql-8.0

MY_CHARSET_INFO used with exposed api mysql_get_character_set_info
rather than internal structures.

Author: grooverdan

ext/mysqli/mysqli_api.c

@@ -614,7 +614,7 @@ PHP_FUNCTION(mysqli_change_user)
 	size_t			user_len, password_len, dbname_len;
 	zend_ulong		rc;
 #if !defined(MYSQLI_USE_MYSQLND) && defined(HAVE_MYSQLI_SET_CHARSET)
-	const		CHARSET_INFO * old_charset;
+	MY_CHARSET_INFO old_charset;
 #endif
 
 	if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(), "Osss!", &mysql_link, mysqli_link_class_entry, &user, &user_len, &password, &password_len, &dbname, &dbname_len) == FAILURE) {
@@ -623,7 +623,7 @@ PHP_FUNCTION(mysqli_change_user)
 	MYSQLI_FETCH_RESOURCE_CONN(mysql, mysql_link, MYSQLI_STATUS_VALID);
 
 #if !defined(MYSQLI_USE_MYSQLND) && defined(HAVE_MYSQLI_SET_CHARSET)
-	old_charset = mysql->mysql->charset;
+	mysql_get_character_set_info(mysql->mysql, &old_charset);
 #endif
 
 #if defined(MYSQLI_USE_MYSQLND)
@@ -643,7 +643,7 @@ PHP_FUNCTION(mysqli_change_user)
 		  5.0 doesn't support it. Support added in 5.1.23 by fixing the following bug :
 		  Bug #30472 libmysql doesn't reset charset, insert_id after succ. mysql_change_user() call
 		*/
-		rc = mysql_set_character_set(mysql->mysql, old_charset->csname);
+		rc = mysql_set_character_set(mysql->mysql, old_charset.csname);
 	}
 #endif
 
@@ -1716,10 +1716,12 @@ static int mysqli_options_get_option_zval_type(int option)
 #endif /* MySQL 4.1.0 */
 		case MYSQL_OPT_READ_TIMEOUT:
 		case MYSQL_OPT_WRITE_TIMEOUT:
+#ifdef MYSQL_OPT_GUESS_CONNECTION /* removed in MySQL-8.0 */
 		case MYSQL_OPT_GUESS_CONNECTION:
 		case MYSQL_OPT_USE_EMBEDDED_CONNECTION:
 		case MYSQL_OPT_USE_REMOTE_CONNECTION:
 		case MYSQL_SECURE_AUTH:
+#endif
 #ifdef MYSQL_OPT_RECONNECT
 		case MYSQL_OPT_RECONNECT:
 #endif /* MySQL 5.0.13 */

ext/mysqli/mysqli_nonapi.c

@@ -303,7 +303,8 @@ void mysqli_common_connect(INTERNAL_FUNCTION_PARAMETERS, zend_bool is_real_conne
 	php_mysqli_set_error(mysql_errno(mysql->mysql), (char *) mysql_error(mysql->mysql));
 
 #if !defined(MYSQLI_USE_MYSQLND)
-	mysql->mysql->reconnect = MyG(reconnect);
+	char reconnect = MyG(reconnect);
+	mysql_options(mysql->mysql, MYSQL_OPT_RECONNECT, (char *)&reconnect);
 #endif
 	unsigned int allow_local_infile = MyG(allow_local_infile);
 	mysql_options(mysql->mysql, MYSQL_OPT_LOCAL_INFILE, (char *)&allow_local_infile);

ext/mysqli/php_mysqli_structs.h

@@ -58,8 +58,6 @@
 #define HAVE_ULONG
 #endif
 
-#include <my_global.h>
-
 #if !defined(HAVE_MBRLEN) && defined(WE_HAD_MBRLEN)
 #define HAVE_MBRLEN 1
 #endif
@@ -68,20 +66,12 @@
 #define HAVE_MBSTATE_T 1
 #endif
 
-/*
-  We need more than mysql.h because we need CHARSET_INFO in one place.
-  This order has been borrowed from the ODBC driver. Nothing can be removed
-  from the list of headers :(
-*/
-
-#include <my_sys.h>
 #include <mysql.h>
+#ifndef my_bool
+typedef char		my_bool;
+#endif
 #include <errmsg.h>
-#include <my_list.h>
-#include <m_string.h>
 #include <mysqld_error.h>
-#include <my_list.h>
-#include <m_ctype.h>
 #include "mysqli_libmysql.h"
 #endif /* MYSQLI_USE_MYSQLND */