[versioner] Use libclang-cpp.so

Bug: http://b/150809112

This is a new upstream library that exports both the clang and LLVM C++
symbols and can replace libLLVM and (android-toolchain-only)
libclang_cxx.so.

Test: Build and run versioner
Change-Id: Ib711c29f478e00e39f26dd09917618b349f0c786
diff --git a/tools/versioner/src/Android.bp b/tools/versioner/src/Android.bp
index 0173c41..abcaaa3 100644
--- a/tools/versioner/src/Android.bp
+++ b/tools/versioner/src/Android.bp
@@ -21,8 +21,7 @@
     ],
 
     shared_libs: [
-        "libclang_cxx_host",
-        "libLLVM_host",
+        "libclang-cpp_host",
         "libbase",
     ],