How to fix drush php configuration on the hosting?
I had to use --php-options parameter. The working command looks like this:

/opt/php/bin/php -c /home/pisar/etc/php.ini -d memory_limit=128M 
                    /home/pisar/opt/drush.php --php=/opt/php/bin/php
                    --php-options="-c /home/pisar/etc/php.ini
                    -d memory_limit=128M" upc -y drupal