Add a heap allocator.

Bug: 223166344
Test: Ran unprotected VM under crosvm.
Change-Id: Ia004b21604ed6f2d0edc7bc7c317f3de35844dcb
diff --git a/vmbase/example/Android.bp b/vmbase/example/Android.bp
index 4cc4bf3..9c19693 100644
--- a/vmbase/example/Android.bp
+++ b/vmbase/example/Android.bp
@@ -13,6 +13,7 @@
         "libcore.rust_sysroot",
     ],
     rustlibs: [
+        "libbuddy_system_allocator",
         "libvmbase",
     ],
     enabled: false,