Blame arch/nt32/bits/stdarg.h

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