[MERGE][1.15.1] use zdll on Windows to build chk_map extension

[Alexander Belchenko]

Alexander Belchenko пишет:
> This patch done for 1.15 branch. It will be *very* good to have it in 
> 1.15.1.
> 
> Corresponding patch for bzr.dev still is not approved, although it's 
> based on Robert Collins review.
> 
One more time with valid submit branch.
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