libc++abi no longer has a cxa_demangle.h header.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@191935 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 20d2ab0..1d4375d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -143,7 +143,7 @@
     )
 elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxabi")
   setup_abi_lib("LIBCXX_LIBCXXABI_INCLUDE_PATHS" ""
-    "c++abi" "cxxabi.h;cxa_demangle.h" ""
+    "c++abi" "cxxabi.h" ""
     )
 elseif ("${LIBCXX_CXX_ABI}" STREQUAL "libcxxrt")
   setup_abi_lib("LIBCXX_LIBCXXRT_INCLUDE_PATHS" "-DLIBCXXRT"