[Issue 20210] version blocks with boolean operators

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=20210

--- Comment #1 from KnightMare <black80 at bk.ru> ---
this issue comes from 
https://issues.dlang.org/show_bug.cgi?id=20211
where I tried to determine probably existing version

"OT:" comes from issue:20211 too. 
then I decided to split issues.
so just ignore "OT:" in header

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