allow libcxx to be used from host builds

Bug: 171749953
Test: compile
Change-Id: Ib9862254e14f4587cb5e8766eb1a74ebb2c5366c
diff --git a/Android.bp b/Android.bp
index 3786ac3..9d57757 100644
--- a/Android.bp
+++ b/Android.bp
@@ -14,6 +14,7 @@
         "libcxxbridge03",
     ],
     shared_libs: ["libc++"],
+    host_supported: true,
 }
 
 cc_library_static {