package management – Why is ‘my_global.h’ from libmysqlclient-dev is missing in Ubuntu 20.04

There’s package libmysqlclient-dev, providing MySQL API. In Ubuntu versions before 20.04 it contains header file ‘/usr/include/mysql/my_global.h’, but in 20.04 there’s no such file in package, as well as some other files.

Can anybody explain, why is that so, and how can one work around this to compile application, which depends on this header?