[CMake] Fix broken builds from r309029

Fixing the mismatched beginning if and endif contents.

llvm-svn: 309030
diff --git a/llvm/cmake/modules/TableGen.cmake b/llvm/cmake/modules/TableGen.cmake
index 8ee7f97..7f17f70 100644
--- a/llvm/cmake/modules/TableGen.cmake
+++ b/llvm/cmake/modules/TableGen.cmake
@@ -121,7 +121,7 @@
       COMMENT "Building libLLVMTableGen for native TableGen..."
       USES_TERMINAL)
   add_custom_target(NATIVE_LIB_LLVMTABLEGEN DEPENDS LIB_LLVMTABLEGEN)
-endif(LLVM_USE_HOST_TOOLS)
+endif()
 
 macro(add_tablegen target project)
   set(${target}_OLD_LLVM_LINK_COMPONENTS ${LLVM_LINK_COMPONENTS})