message: doc: Update zlib info in dependencies.md
diff: @@ -26,7 +26,7 @@ These are the dependencies currently used by Peercoin. You can find instructions
  | XCB | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
  | xkbcommon | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) (Linux only) |
  | ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.0.0 | No | | |
  -| zlib | [1.2.11](https://zlib.net/) | | | | No |
  +| zlib | | | | | [Yes](https://github.com/bitcoin/bitcoin/blob/master/depends/packages/qt.mk) |
  Controlling dependencies
  ------------------------
  @@ -43,3 +43,4 @@ Some dependencies are not needed in all configurations. The following are some f
  #### Other
  * librsvg is only needed if you need to run `make deploy` on (cross-compilation to) macOS.
  +* Not-Qt-bundled zlib is required to build the [DMG tool](../contrib/macdeploy/README.md#deterministic-macos-dmg-notes) from the libdmg-hfsplus project.
  