Build and package lib{LLVM,clang}_android.so

Bug: http://b/64121881

This is the first step before updating prebuilts and switching RS
modules to depend on these renamed libraries instead of libLLVM.so and
libclang.so.

Test: python frameworks/rs/build-rs.py

Change-Id: Id85283bde550b18aebbab6ad6c386aadbcd823c8
diff --git a/Android.mk b/Android.mk
index ffd9be3..a64fc08 100644
--- a/Android.mk
+++ b/Android.mk
@@ -14,7 +14,9 @@
     librsrt_arm64.bc \
     librsrt_mips.bc \
     librsrt_x86.bc \
-    librsrt_x86_64.bc
+    librsrt_x86_64.bc \
+    libLLVM_android-host64 \
+    libclang_android-host64
 
 ifneq ($(HOST_OS),darwin)
 rs-prebuilts-full: \