Description:
------------
All PHP > 7.1 versions has following declarations in ext/mysqlnd/mysqlnd_ext_plugin.h:

extern struct st_mysqlnd_plugin__plugin_area_getters mysqlnd_plugin_area_getters;
....
....
extern struct st_mysqlnd_plugin_methods_xetters mysqlnd_plugin_methods_xetters;

but these lack external visibility for myslnd plugin extensions, so any call to the  mysqlnd_plugin_get_* and mysqlnd_*_get/set methods leads to "undefined symbol".

Declarations should be changed to:

PHPAPI extern struct st_mysqlnd_plugin__plugin_area_getters mysqlnd_plugin_area_getters;
....
....
PHPAPI extern struct st_mysqlnd_plugin_methods_xetters mysqlnd_plugin_methods_xetters;