LLVM+Clang: don't have a dependency on libclang.

Author: agarny

src/3rdparty/LLVMClang/CMakeLists.txt

@@ -225,7 +225,6 @@ set(LLVMCLANG_LIBRARIES
     clangToolingRefactoring
     clangToolingSyntax
     clangTransformer
-    libclang
     LLVMAggressiveInstCombine
     LLVMAnalysis
     LLVMAsmParser