Add -Werror for android target.

* The "android" target is not covered by "not_windows".

Bug: 66996870
Test: build with WITH_TIDY=1
Change-Id: I2ebdc6a132ac8f6b410a86badd58efa9ab6c088e
diff --git a/Android.bp b/Android.bp
index 4270654..c76718e 100644
--- a/Android.bp
+++ b/Android.bp
@@ -43,6 +43,9 @@
         not_windows: {
             cflags: ["-Werror"],
         },
+        android: {
+            cflags: ["-Werror"],
+        },
     },
 }