Add tools/apkzlib to master-art manifest.

This project is now required to build master-art.

Change-Id: I3523d33645d6ffb3be1bdac6c1781179e6960bc5

default.xml

@@ -134,6 +134,7 @@
   <project path="system/timezone" name="platform/system/timezone" groups="pdk" />
   <project path="toolchain/pgo-profiles" name="toolchain/pgo-profiles" />
   <project path="tools/apksig" name="platform/tools/apksig" groups="pdk,tradefed" />
+  <project path="tools/apkzlib" name="platform/tools/apkzlib" groups="pdk,tradefed" />
   <project path="tools/dexter" name="platform/tools/dexter" groups="tools" />
   <project path="tools/metalava" name="platform/tools/metalava" groups="tools" />
 </manifest>