regex: no 'static inline'

regex: no 'static inline'

* lib/regex_internal.c (calc_state_hash):
* lib/regex_internal.h (bitset_set, bitset_clear, bitset_contain)
(bitset_empty, bitset_set_all, bitset_copy, bitset_not, bitset_merge)
(bitset_mask, re_string_char_size_at, re_string_wchar_at):
Now static, not static inline.
(inline) [__GNUC__ < 3 && _LIBC]:
Remove macro; no longer needed.