vm_dump.c: rename HAVE_BACKTRACE to USE_BACKTRACE
Co-authored-by: xtkoba (Tee KOBAYASHI) xtkoba+ruby@gmail.com
vm_dump.c: rename HAVE_BACKTRACE to USE_BACKTRACE
Co-authored-by: xtkoba (Tee KOBAYASHI) xtkoba+ruby@gmail.com