Remove note on v8 not being buildable with g++ 4.8
Remove note on v8 not being buildable with g++ 4.8

The issue on code.google.com is long closed.
Besides I've just tried and it just works.
dayed/v8js,dayed/v8js,preillyme/v8js,rosmo/v8js,dayed/v8js,preillyme/v8js,ABaldwinHunter/v8js-clone,zzhh9857/v8js,uniconstructor/v8js,rosmo/v8js,stesie/v8js,stesie/v8js,dayed/v8js,stesie/v8js,zzhh9857/v8js,zzhh9857/v8js,ABaldwinHunter/v8js-clone,phpv8/v8js,php/pecl-languages-v8js,ABaldwinHunter/v8js-clone,stesie/v8js,zzhh9857/v8js,php/pecl-languages-v8js,preillyme/v8js,uniconstructor/v8js,ABaldwinHunter/v8js-clone,php/pecl-languages-v8js,preillyme/v8js,php/pecl-languages-v8js,uniconstructor/v8js,phpv8/v8js,uniconstructor/v8js,phpv8/v8js,rosmo/v8js,rosmo/v8js