Update the CMake build for clang-tblgen to reflect that it directly

depends on the Support library rather than relying on TableGen's
transitive dependency.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@143532 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CMakeLists.txt

 set(LLVM_REQUIRES_EH 1)
 set(LLVM_REQUIRES_RTTI 1)
+set(LLVM_LINK_COMPONENTS Support)
 
 add_tablegen(clang-tblgen CLANG
   ClangASTNodesEmitter.cpp