I believe the MySQL library used by MapGuide is statically linked into the FDO provider for linux hence there is no shared library. MySQL connectivity should work within MapGuide for spatial connections. For MySQL ODBC you will need to install the ODBC Connector and manually create or modify odbc.ini and odbcinst.ini files. You shouldn't need unixODBC for this.
I don't want to take back datas from Studio with FDO, I want to make a parcels.php, and for example, in this file call to the database server, and fill a table. The error is the php package, precompiled withouth mysql support on Linux.