[CMake] Use #cmakedefine01 for CLANG_ENABLE_(ARCMT|OBJC_REWRITER|STATIC_ANALYZER)

It'd be better that they are #cmakedefine01 rather than #cmakedefine.
(#if FOO rather than #if defined(FOO))
Then we can find missing #include "clang/Config/config.h" in the future.

Differential Revision: https://reviews.llvm.org/D35541

llvm-svn: 316061
diff --git a/clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp b/clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp
index 21686b8..1954b24 100644
--- a/clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp
+++ b/clang/lib/Frontend/Rewrite/RewriteModernObjC.cpp
@@ -31,7 +31,7 @@
 #include "llvm/Support/raw_ostream.h"
 #include <memory>
 
-#ifdef CLANG_ENABLE_OBJC_REWRITER
+#if CLANG_ENABLE_OBJC_REWRITER
 
 using namespace clang;
 using llvm::utostr;