Stop #define'ing __ANDROID_API__.

The correct way to make this work for the host fuzzers is to use the
"libbinder_ndk_host_user" defaults.

Also normalize the non-bionic definitions of __INTRODUCED_IN() to match
the majority.

Bug: http://b/178449269
Test: treehugger
Change-Id: I2df8bf705600544553f4889d39f7740136dcff48
diff --git a/media/extractors/wav/Android.bp b/media/extractors/wav/Android.bp
index 85d4cce..6a0ef22 100644
--- a/media/extractors/wav/Android.bp
+++ b/media/extractors/wav/Android.bp
@@ -1,7 +1,7 @@
 cc_library {
     name: "libwavextractor",
 
-    defaults: ["extractor-defaults"],
+    defaults: ["extractor-defaults", "libbinder_ndk_host_user"],
 
     srcs: ["WAVExtractor.cpp"],