[clang] Fix the tooling build after D119130

New StandardLibrary.cpp depends on Clang AST, add the dependency to
CMakeLists.txt

Broken builbot: https://lab.llvm.org/buildbot/#/builders/57/builds/14892

Author: kirillbobyrev

clang/lib/Tooling/Inclusions/CMakeLists.txt

@@ -6,6 +6,7 @@ add_clang_library(clangToolingInclusions
   StandardLibrary.cpp
 
   LINK_LIBS
+  clangAST
   clangBasic
   clangLex
   clangRewrite