[CMake] clang/lib: Satisfy dependencies to add *actually used* libraries on target_link_libraries() and LLVM_LINK_COMPONENTS.

I will prune redundant dependencies later.

llvm-svn: 196800
diff --git a/clang/lib/Format/CMakeLists.txt b/clang/lib/Format/CMakeLists.txt
index e3ef5bd..58e01e6 100644
--- a/clang/lib/Format/CMakeLists.txt
+++ b/clang/lib/Format/CMakeLists.txt
@@ -20,10 +20,11 @@
   )
 
 target_link_libraries(clangFormat
-  clangBasic
-  clangFrontend
   clangAST
   clangASTMatchers
+  clangBasic
+  clangFrontend
+  clangLex
   clangRewriteCore
   clangRewriteFrontend
   clangTooling