Function ruster::pg_dump_all_databases

#[no_mangle]
pub extern "C" fn pg_dump_all_databases(
    host: *const c_char, 
    port: *const c_char, 
    user: *const c_char, 
    database: *const c_char, 
    filename_pattern: *const c_char, 
    verbose: *const c_char
)