Revert "Add build rule for dng_validate_host"

This reverts commit 02315661e9119e78d42303609671f08138e4665e.

Reason for revert: broke mac build

Change-Id: I0c30c7246d2d6c901931da7a15d3c9e3939ae68f
diff --git a/Android.bp b/Android.bp
index 101018a..b7a4c0c 100644
--- a/Android.bp
+++ b/Android.bp
@@ -149,16 +149,3 @@
         "libjpeg",
     ],
 }
-
-cc_binary_host {
-    name: "dng_validate_host",
-    defaults: ["libdng_sdk-defaults"],
-    srcs: ["source/dng_validate.cpp"],
-
-    cflags: ["-DqDNGValidate=1"],
-
-    shared_libs: [
-        "libz",
-        "libjpeg",
-    ],
-}