fix VERSION_INT() order

defined in pvxs/version.h included via utilpvt.h

src/log.cpp

@@ -28,15 +28,12 @@
 #include <epicsGuard.h>
 #include <epicsTime.h>
 
-#if EPICS_VERSION_INT>=VERSION_INT(3,15,0,0)
-#  include <epicsStackTrace.h>
-#  define USE_STACKTRACE
-#endif
-
 #include "evhelper.h"
 #include "utilpvt.h"
 
-#ifndef USE_STACKTRACE
+#if EPICS_VERSION_INT>=VERSION_INT(3,15,0,0)
+#    include <epicsStackTrace.h>
+#else
 static void epicsStackTrace() {}
 #endif