[Kaleidoscope] LLVM is not needed for chapter two (#69823)

Since the example (llvm/examples/Kaleidoscope/Chapter2/toy.cpp) is
self-contained there is no need to use LLVM.

llvm/docs/tutorial/MyFirstLanguageFrontend/LangImpl02.rst

@@ -716,15 +716,12 @@ Intermediate Representation (IR) from the AST.
 Full Code Listing
 =================
 
-Here is the complete code listing for our running example. Because this
-uses the LLVM libraries, we need to link them in. To do this, we use the
-`llvm-config <https://llvm.org/cmds/llvm-config.html>`_ tool to inform
-our makefile/command line about which options to use:
+Here is the complete code listing for our running example.
 
 .. code-block:: bash
 
     # Compile
-    clang++ -g -O3 toy.cpp `llvm-config --cxxflags`
+    clang++ -g -O3 toy.cpp
     # Run
     ./a.out
 

llvm/examples/Kaleidoscope/Chapter2/CMakeLists.txt

@@ -1,7 +1,3 @@
-set(LLVM_LINK_COMPONENTS
-  Support
-  )
-
 add_kaleidoscope_chapter(Kaleidoscope-Ch2
   toy.cpp
   )