Exported function get_charset() name conflicts with samba

MariaDB exports a few functions called "get_charset*" in libmariadbd.so.19. This conflicts with libsmbconf.so.0, which also exports a function with the same name "get_charset()".

Therefore, if an application (for example, Amarok on KDE) links both so libraries, a name conflict will happen and the application will crash.

It is a question whether MariaDB or Samba team should rename the function, but the best practice will be renaming the "get_charset" function to "mariadb_get_charset" and "samba_get_charset" function, respectively.

Related MariaDB code:

• https://github.com/MariaDB/server/blob/a13fac9eeef0f304b6b6f52ad2b6659f22190523/include/my_sys.h#L1029

Related Samba code:

• https://github.com/samba-team/samba/blob/8b4c6fb7c84e12498a799d155ef6dd439c3fc222/source3/registry/reg_parse_internal.h#L76