array-oset, linkedhash-list, rbtree-oset: no need for 'inline'

array-oset, linkedhash-list, rbtree-oset: no need for 'inline'

* lib/gl_array_oset.c (gl_array_nx_add_at):
(gl_array_remove_at):
* lib/gl_linkedhash_list.c (hash_resize_after_add)
(add_to_bucket, remove_from_bucket):
* lib/gl_rbtree_oset.c (rotate_left, rotate_right):
Change 'static inline' to 'static', as it's simpler to omit
'inline' unless there's a significant performance advantage.