dcodeIO/webassembly

#define va_start(v,l)   __builtin_va_start(v,l)
#define va_end(v)       __builtin_va_end(v)
#define va_arg(v,l)     __builtin_va_arg(v,l)
#define va_copy(d,s)    __builtin_va_copy(d,s)