Fix mac build

oatdumps used to only be built when ART_BUILD_HOST_STATIC was set,
which was never set on macs, disable oatdumps and oatdumpds on macs.

Change-Id: I93a770cfa6a92ba7ed47a1501962ea9ddb25eba5
diff --git a/oatdump/Android.bp b/oatdump/Android.bp
index 169822c..b01bf51 100644
--- a/oatdump/Android.bp
+++ b/oatdump/Android.bp
@@ -53,6 +53,11 @@
 art_cc_binary {
     name: "oatdumps",
     defaults: ["oatdump-defaults"],
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
     static_libs: [
         "libart",
         "libart-compiler",
@@ -68,6 +73,11 @@
         "art_debug_defaults",
         "oatdump-defaults",
     ],
+    target: {
+        darwin: {
+            enabled: false,
+        },
+    },
     static_libs: [
         "libartd",
         "libartd-compiler",