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.

https://packages.ubuntu.com/ru/bionic/amd64/libmysqlclient-dev/filelist

https://packages.ubuntu.com/ru/focal/amd64/libmysqlclient-dev/filelist

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