In mysql_init() charset is set to NULL .
In mysql_read_connect() charset is not changed if already set

This allows proxysql to change it outside the library

This fix a crashing bug

…id non returning functions

Collation latin1_german1_ci was incorrectly named latin1_german_ci in libmariadbclient .
This seems to be fixed in version 3.1 but not in 3.0 .
Do not port this commit to proxysql 2.1 because it already uses libmariadbclient 3.1

This is an extension of commit 1ecb00f about mysql_real_connect

It also changes mysql_optionsv() for MYSQL_SET_CHARSET_NAME

… charset if collation ID is greater or equal than 255 (utf8mb4_0900_ai_ci)

We call mysql_options with MYSQL_SET_CHARSET_NAME if collation ID >= 255 .
This to solve the problem of MySQL server returning an Access denied if the backend doesn't support a collation during mysql_change_user

…erly setting collation specified by the client