help_drv_mysql.t: compression algorithm is not always available

tests/t/help_drv_mysql.t

@@ -8,7 +8,7 @@ Skip test if the MySQL driver is not available.
   $ sysbench --help | grep -- '--db-driver'
     --db-driver=STRING  specifies database driver to use ('help' to get list of available drivers) [mysql]
 
-  $ sysbench --help | sed -n '/mysql options:/,/^$/p'
+  $ sysbench --help | sed -n '/mysql options:/,/^$/p' | grep -v 'compression algorithms'
   mysql options:
     --mysql-host=[LIST,...]               MySQL server host [localhost]
     --mysql-port=[LIST,...]               MySQL server port [3306]
@@ -22,7 +22,6 @@ Skip test if the MySQL driver is not available.
     --mysql-ssl-cert=STRING               path name of the client public key certificate file
     --mysql-ssl-cipher=STRING             use specific cipher for SSL connections []
     --mysql-compression[=on|off]          use compression, if available in the client library [off]
-    --mysql-compression-algorithms=STRING compression algorithms to use [zlib]
     --mysql-debug[=on|off]                trace all client library calls [off]
     --mysql-ignore-errors=[LIST,...]      list of errors to ignore, or "all" [1213,1020,1205]
     --mysql-dry-run[=on|off]              Dry run, pretend that all MySQL client API calls are successful without executing them [off]