Add # apex symbols.

Bug: 120637510
Test: manually verify APEX symbols aren't in the NDK stub
m libbinder_ndk libbinder_ndk.ndk.Q libbinder_ndk.ndk.current
readelf -Ws $ANDROID_PRODUCT_OUT/obj/SHARED_LIBRARIES/libbinder_ndk.ndk.Q_intermediates/libbinder_ndk.so | grep AServiceManager
< command failed >
readelf -Ws $ANDROID_PRODUCT_OUT/obj/SHARED_LIBRARIES/libbinder_ndk.ndk.current_intermediates/libbinder_ndk.so | grep AServiceManager
< command failed >
readelf -Ws $ANDROID_PRODUCT_OUT/obj/SHARED_LIBRARIES/libbinder_ndk_intermediates/libbinder_ndk.so | grep AServiceManager_getService
   261: 000000000000ede8   244 FUNC    GLOBAL DEFAULT   14 AServiceManager_getService

Change-Id: I9377c72c30fbad5993d580506ed5a061f78e81b6
diff --git a/libs/binder/ndk/Android.bp b/libs/binder/ndk/Android.bp
index 1b69dfd..05655c1 100644
--- a/libs/binder/ndk/Android.bp
+++ b/libs/binder/ndk/Android.bp
@@ -23,7 +23,11 @@
         "include_apex",
     ],
 
-    cflags: ["-Wall", "-Wextra", "-Werror"],
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+    ],
 
     srcs: [
         "ibinder.cpp",