Remove stray V8JS_DEBUG define
Remove stray V8JS_DEBUG define

Currently it just enables RSHUTDOWN code that should print
memory usage statistics. However the code implements API calls
that aren't supported anymore (for a long time).

uniconstructor/v8js,zzhh9857/v8js,ABaldwinHunter/v8js-clone,uniconstructor/v8js,dayed/v8js,preillyme/v8js,dayed/v8js,preillyme/v8js,ABaldwinHunter/v8js-clone,stesie/v8js,stesie/v8js,uniconstructor/v8js,stesie/v8js,rosmo/v8js,rosmo/v8js,preillyme/v8js,rosmo/v8js,dayed/v8js,stesie/v8js,uniconstructor/v8js,rosmo/v8js,phpv8/v8js,ABaldwinHunter/v8js-clone,zzhh9857/v8js,dayed/v8js,phpv8/v8js,zzhh9857/v8js,zzhh9857/v8js,ABaldwinHunter/v8js-clone,phpv8/v8js,preillyme/v8js