Adjusted to take in account that...

With the curl memory tracking feature decoupled from the debug build feature,
CURLDEBUG and DEBUGBUILD preprocessor symbol definitions are used as follows:

CURLDEBUG used for curl debug memory tracking specific code (--enable-curldebug)

DEBUGBUILD used for debug enabled specific code (--enable-debug)

setup_once.h

@@ -297,7 +297,7 @@ typedef int sig_atomic_t;
  * Macro used to include code only in debug builds.
  */
 
-#ifdef CURLDEBUG
+#ifdef DEBUGBUILD
 #define DEBUGF(x) x
 #else
 #define DEBUGF(x) do { } while (0)
@@ -308,7 +308,7 @@ typedef int sig_atomic_t;
  * Macro used to include assertion code only in debug builds.
  */
 
-#if defined(CURLDEBUG) && defined(HAVE_ASSERT_H)
+#if defined(DEBUGBUILD) && defined(HAVE_ASSERT_H)
 #define DEBUGASSERT(x) assert(x)
 #else
 #define DEBUGASSERT(x) do { } while (0)