Enable 64-bit compiling on Windows (tested on 64-bit Win 7) in startjsfunfuzz.py and fix some nits.
Enable 64-bit compiling on Windows (tested on 64-bit Win 7) in startjsfunfuzz.py and fix some nits.

nth10sd/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,nth10sd/funfuzz,MozillaSecurity/funfuzz,MozillaSecurity/funfuzz