Implements hook_modules_uninstalled().
Cleans up {block}, {block_role} and {block_language} tables from modules' blocks.
function block_modules_uninstalled($modules) {
db_delete('block')
->condition('module', $modules, 'IN')
->execute();
db_delete('block_role')
->condition('module', $modules, 'IN')
->execute();
db_delete('block_language')
->condition('module', $modules, 'IN')
->execute();
}