The problem was that MySQL hadn't true ctype implementation. As a
result many multibyte punctuation/whitespace characters were
treated as word characters.
This fix uses recently added CTYPE table for unicode character sets
(WL1386) to detect unicode punctuation/whitespace characters
correctly.
Note: this is incompatible change since it changes parser behavior.
One will have to use REPAIR TABLE statement to rebuild fulltext
indexes.
for uca collation isalnum and strnncollsp don't agree on whether
0xC2A0 is a space (strnncollsp is right, isalnum is wrong).
they still don't, the bug was fixed by avoiding strnncollsp
