After-merge fix of the Windows build

include/my_stacktrace.h

@@ -42,19 +42,21 @@
 C_MODE_START
 
 #if defined(HAVE_STACKTRACE) || defined(HAVE_BACKTRACE)
-void my_setup_stacktrace(void);
 void my_print_stacktrace(uchar* stack_bottom, ulong thread_stack,
                          my_bool silent);
 int my_safe_print_str(const char* val, size_t max_len);
 void my_write_core(int sig);
-#if BACKTRACE_DEMANGLE
+# if BACKTRACE_DEMANGLE
 char *my_demangle(const char *mangled_name, int *status);
-#endif /* BACKTRACE_DEMANGLE */
-#ifdef __WIN__
+# endif /* BACKTRACE_DEMANGLE */
+# ifdef __WIN__
+#  define my_setup_stacktrace()
 void my_set_exception_pointers(EXCEPTION_POINTERS *ep);
-#endif /* __WIN__ */
+# else
+void my_setup_stacktrace(void);
+# endif /* __WIN__ */
 #else
-#define my_setup_stacktrace()
+# define my_setup_stacktrace()
 #endif /* ! (defined(HAVE_STACKTRACE) || defined(HAVE_BACKTRACE)) */
 
 #ifndef _WIN32