libwfdaac_vendor: Allow building 32bit variant

Change-Id: I368df52052c6cdc55d447cf5c0328b5a5dfdad23
diff --git a/libaac/Android.mk b/libaac/Android.mk
index 96a7fe2..dd21454 100644
--- a/libaac/Android.mk
+++ b/libaac/Android.mk
@@ -21,7 +21,6 @@
 
 LOCAL_VENDOR_MODULE := true
 
-LOCAL_MULTILIB := 64
 LOCAL_MODULE := libwfdaac_vendor
 LOCAL_CFLAGS += -O0