[mac] link against libz in a more civilized manner
https://bugs.webkit.org/show_bug.cgi?id=120258

Reviewed by Darin Adler.

* Configurations/JavaScriptCore.xcconfig: Removed “-lz” from OTHER_LDFLAGS_BASE.
* JavaScriptCore.xcodeproj/project.pbxproj: Added libz.dylib to the JavaScriptCore target’s
Link Binary With Libraries build phase.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@154557 268f45cc-cd09-0410-ab3c-d52691b4dbfc