[MDEV-6819] st_mysql_show_var::value should be void* not char* - Jira

Description:
... as conversion from function pointer to char* is not allowed in C / C++

How to repeat:
In my plugin I have:

static struct st_mysql_show_var my_plugin_statvars[]=

    {"my_show_entry", (char *)&show_my_entry, SHOW_FUNC}

with C I'm getting

my_plugin.c:131:32: warning: ISO C forbids conversion of function pointer to object pointer type [-Wpedantic]

    {"my_show_entry", (char *)&show_my_entry, SHOW_FUNC}

and with C++

my_plugin.cc:131:41: warning: ISO C++ forbids casting between pointer-to-function and pointer-to-object [enabled by default]

    {"my_show_entry", (char *)&show_my_entry, SHOW_FUNC}

Suggested fix:
Change st_mysql_show_var::value type to void* to allow writing of warning-free plugin code

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