Remove support for FUSE compatibility < 25

While the default FUSE_USE_VERSION is 21, compatibility versions below 25 are rarely (if at all) used;
keeping support for them is not worth, especially than they require a number of special casings all around
(different fuse_operations and fuse_file_info).

* src/fuse_i.h (fuse_ops_compat22, fuse_ops_compat2): Remove.
(FUSE_OP_HAVE, FUSE_OP_CALL): Use only fuse_ops25.
(FUSE_OP_HAVE22, FUSE_OP_CALL22): Remove.
(NN_INFO, NN_INFO_APPLY): Use only info25.
(struct netnode): Remove field 'compat22' in field union 'info'.
* src/main.c (fuse_ops_compat22, fuse_ops_compat2, fuse_main_compat2)
(fuse_main_compat2, fuse_main_real_compat22, fuse_new_compat2)
(fuse_new_compat22, fuse_mount_compat22): Remove.
* src/netfs.c (netfs_attempt_statfs, netfs_attempt_sync, netfs_attempt_write)
(netfs_attempt_read, fuse_get_inode, get_dirents_getdir, get_dirents_readdir)
(netfs_get_dirents): Use only FUSE_OP_CALL and FUSE_OP_HAVE.
(get_dirents_getdir_helper_compat): Remove.
* src/netnode.c (fuse_sync_filesystem): Use only FUSE_OP_CALL and NN_INFO.

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