mysql.h: include plugin_auth_common.h for net_async_status enum

[tjanas]

Function declarations in mysql.h refer to enum net_async_status enum which is defined in plugin_auth_common.h

With g++ 9.5.0 under Ubuntu 22.04.1 LTS, the following errors are produced:

error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_real_connect_nonblocking(
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_send_query_nonblocking(
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_real_query_nonblocking(
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_next_result_nonblocking(MYSQL *mysql);
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_select_db_nonblocking(MYSQL *mysql,
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_free_result_nonblocking(MYSQL_RES *result);
      ^~~~~~~~~~~~~~~~
error: use of enum ‘net_async_status’ without previous declaration
 enum net_async_status STDCALL mysql_fetch_row_nonblocking(MYSQL_RES *res,
      ^~~~~~~~~~~~~~~~

This issue was also reported by vincefn/objcryst#48

I confirm the code being submitted is offered under the terms of the OCA, and that I am authorized to contribute it.

[mysql-oca-bot]

Hi, thank you for submitting this pull request. In order to consider your code we need you to sign the Oracle Contribution Agreement (OCA). Please review the details and follow the instructions at https://oca.opensource.oracle.com/
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Thanks

[tjanas]

OCA has already been submitted.

[tjanas]

Also reported here: https://boinc.berkeley.edu/forum_thread.php?id=14615