Re-run cargo_embargo to remove duplicate cfgs.

No need to run cargo build either.

Test: Looked at output Android.bp.
Change-Id: Ia2cca7139154cf5c84bb4acf01bfe0d309e3c1c2
diff --git a/Android.bp b/Android.bp
index 2e98795..c09aef6 100644
--- a/Android.bp
+++ b/Android.bp
@@ -36,10 +36,7 @@
         "std",
         "x509",
     ],
-    cfgs: [
-        "mls_build_async",
-        "mls_build_async",
-    ],
+    cfgs: ["mls_build_async"],
     rustlibs: [
         "libhex",
         "libmls_rs_codec",
diff --git a/cargo_embargo.json b/cargo_embargo.json
index 2a253ec..de66107 100644
--- a/cargo_embargo.json
+++ b/cargo_embargo.json
@@ -1,3 +1,4 @@
 {
-    "extra_cfg": ["mls_build_async"]
+    "extra_cfg": ["mls_build_async"],
+    "run_cargo": false
 }