Allow to set custom function attributes in BPS tree

[rtsisyk]

I want to add "static inline" to BPS tree declaration:

000000000044c50c T vy_mem_tree_approximate_count
000000000044b1a3 T vy_mem_tree_build
000000000044b0e9 T vy_mem_tree_create
00000000004537c8 T vy_mem_tree_delete
000000000044b81f T vy_mem_tree_destroy
000000000044ca02 T vy_mem_tree_find
00000000004536f6 T vy_mem_tree_insert
000000000044bcf0 T vy_mem_tree_invalid_iterator
000000000044bef9 T vy_mem_tree_iterator_are_equal
000000000044c9d4 T vy_mem_tree_iterator_destroy
000000000044c082 T vy_mem_tree_iterator_first
000000000044c979 T vy_mem_tree_iterator_freeze
000000000044c77d T vy_mem_tree_iterator_get_elem
000000000044bd4a T vy_mem_tree_iterator_is_invalid
000000000044c0e3 T vy_mem_tree_iterator_last
000000000044c7cf T vy_mem_tree_iterator_next
000000000044c8a8 T vy_mem_tree_iterator_prev
000000000044c144 T vy_mem_tree_lower_bound
000000000044b850 T vy_mem_tree_mem_used
000000000044b91e T vy_mem_tree_random
000000000044b83e T vy_mem_tree_size
000000000044c317 T vy_mem_tree_upper_bound