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This makes available the __builtin_va_list type and __builtin variants of va_start, va_arg, va_copy and va_end. We do this via a header file that's prepended to all compilations always (except if merely preprocessing): tcc_predefs.h. That header could also be used for predefining other builtins in the future. We don't need the define hacks for musl anymore with this. Also fix x86_64 gfunc_prologue to reserve enoug space for the full va_list structure, not just 16 bytes.