ART: Clean up global includes - zlib

Remove zlib from the ART-global includes.

Test: mmma art
Change-Id: Ib5c12d46aae9cc1288c7a4f2f7e0f60444f2c6e0
diff --git a/dex2oat/Android.bp b/dex2oat/Android.bp
index 6b63878..13d2655 100644
--- a/dex2oat/Android.bp
+++ b/dex2oat/Android.bp
@@ -41,6 +41,7 @@
     ],
     include_dirs: [
         "external/lz4/lib",
+        "external/zlib",
     ],
     export_include_dirs: ["."],
 
@@ -223,6 +224,9 @@
         "linker/oat_writer_test.cc",
     ],
     header_libs: ["dex2oat_headers"],
+    include_dirs: [
+        "external/zlib",
+    ],
     shared_libs: [
         "libartd-compiler",
         "libartd-dexlayout",