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

[John Arbash Meinel]

John Arbash Meinel has voted approve.
Status is now: Approved
Comment:
I'm okay with this, though I'll mention that doing:
mv zdll.lib z.lib

causes the existing code to build just fine and depend on zlib1.dll as 
expected. (That is how I'm building things on kerguelen.) As such, this 
will likely break the kerguelen builds, but I can rename the file back.


For details, see: 
http://bundlebuggy.aaronbentley.com/project/bzr/request/%3Ch06a8r%24v7c%241%40ger.gmane.org%3E
Project: Bazaar