Add LOCAL_MODULE_TAGS := optional

Change-Id: I292f6297b06f97360c15884677057d624e73fbf6
diff --git a/lib/Target/X86/Android.mk b/lib/Target/X86/Android.mk
index 0564759..f2604cd 100644
--- a/lib/Target/X86/Android.mk
+++ b/lib/Target/X86/Android.mk
@@ -42,6 +42,8 @@
 
 LOCAL_MODULE:= libLLVMX86CodeGen
 
+LOCAL_MODULE_TAGS := optional
+
 include $(LLVM_HOST_BUILD_MK)
 include $(LLVM_TBLGEN_RULES_MK)
 include $(LLVM_GEN_INTRINSICS_MK)