Make libeffects build with the VNDK.

When the vndk is enabled (BOARD_VNDK_VERSION=current),
vendor libraries must only link against vendor variants
in the build system. This also means that they receive
restricted sets of headers and that automatic global
headers are restricted.

Test: build libeffects with BOARD_VNDK_VERSION=current
Bug: 37342627
Change-Id: I95b4bc39eb98b5af4069ab64d81574a451c8131f
diff --git a/media/libeffects/config/Android.bp b/media/libeffects/config/Android.bp
index 5666d14..4398a91 100644
--- a/media/libeffects/config/Android.bp
+++ b/media/libeffects/config/Android.bp
@@ -10,5 +10,8 @@
         "libtinyxml2",
     ],
 
+    header_libs: ["libaudio_system_headers"],
+    export_header_lib_headers: ["libaudio_system_headers"],
+
     export_include_dirs: ["include"],
 }