ART: Clean up global includes - zlib

Remove zlib from the ART-global includes.

Test: mmma art
Change-Id: Ib5c12d46aae9cc1288c7a4f2f7e0f60444f2c6e0
diff --git a/compiler/Android.bp b/compiler/Android.bp
index fe0f3c7..8599471 100644
--- a/compiler/Android.bp
+++ b/compiler/Android.bp
@@ -422,6 +422,10 @@
         "libnativeloader",
     ],
 
+    include_dirs: [
+        "external/zlib",
+    ],
+
     target: {
         host: {
             shared_libs: [