Fix CMake.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134918 91177308-0d34-0410-b5e6-96231b3b80d8

tools/libclang/CMakeLists.txt

@@ -28,7 +28,6 @@ set(SOURCES
   CXString.cpp
   CXType.cpp
   ../../include/clang-c/Index.h
-  ../../include/clang-c/ARCMigrate.h
   )
 
 if( LLVM_ENABLE_PIC )