Suppress implicit-fallthrough warnings in nuplayer*.

Add FALLTHROUGH_INTENDED for clang compiler.

Bug: 112564944
Test: build with global -Wimplicit-fallthrough.
Change-Id: I5b7ab7abb46884b363e13284382eddf7a256a3e2
diff --git a/media/libmediaplayer2/nuplayer2/Android.bp b/media/libmediaplayer2/nuplayer2/Android.bp
index 1634f35..c8ddc11 100644
--- a/media/libmediaplayer2/nuplayer2/Android.bp
+++ b/media/libmediaplayer2/nuplayer2/Android.bp
@@ -16,6 +16,7 @@
     ],
 
     header_libs: [
+        "libbase_headers",
         "libmediaplayer2_headers",
         "media_plugin_headers",
     ],