DWARF: fix -Asserts builds

no-op the DWARF tracing macros in non-debug builds.

git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@293008 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/DwarfParser.hpp b/src/DwarfParser.hpp
index f4e5d48..610a3ae 100644
--- a/src/DwarfParser.hpp
+++ b/src/DwarfParser.hpp
@@ -22,14 +22,7 @@
 #include "dwarf2.h"
 
 #include "AddressSpace.hpp"
-
-extern "C" bool logDWARF();
-
-#define _LIBUNWIND_TRACE_DWARF(...)                                            \
-  do {                                                                         \
-    if (logDWARF())                                                            \
-      fprintf(stderr, __VA_ARGS__);                                            \
-  } while (0)
+#include "config.h"
 
 namespace libunwind {