libipanat: Remove deprecated clang property

Change-Id: I189094739247e092f657769d751d7c142694f7d5
diff --git a/ipanat/Android.bp b/ipanat/Android.bp
index 0bcf3a0..7d5bae5 100644
--- a/ipanat/Android.bp
+++ b/ipanat/Android.bp
@@ -22,7 +22,6 @@
     ],
     export_include_dirs: ["inc"],
     vendor: true,
-    clang: true,
 
     cflags: ["-DDEBUG"] + ["-DFEATURE_IPA_ANDROID"] + ["-Wno-int-conversion"],