bug#66327: PARTED_CHECK_LIBPARTED shipped with parted 3.6 fails to detect it

[Jan Palus]

autoconf macro PARTED_CHECK_LIBPARTED requires ped_get_version() to
return 3 part version string or otherwise it fails with "3.6, bad
version string"

        if ( !(version = ped_get_version ()) )
                exit(EXIT_FAILURE);
        if (sscanf(version, "%d.%d.%d", &major, &minor, &micro) != 3) {
                printf("%s, bad version string\n", version);
                exit(EXIT_FAILURE);
        }

Therefore it fails for two part version string like "3.6".