win64: fix va_arg

fixes 5c35ba66c5ade4713bbd9c005e66889f6d7db293

Implementation was consistent within tcc but incompatible
with the ABI (for example library functions vprintf etc)

Also:
- tccpp.c/get_tok_str() : avoid "unknown format "%llu" warning
- x86_64_gen.c/gen_vla_alloc() : fix vstack leak

1 files changed, 1 insertions, 0 deletions

diff --git a/tccgen.c b/tccgen.c
index d7f8c0d..5d92e5f 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -4033,6 +4033,7 @@ ST_FUNC void unary(void)
                 tcc_error("__builtin_va_start expects a local variable");
             vtop->r &= ~(VT_LVAL | VT_REF);
             vtop->type = char_pointer_type;
+            vtop->c.i += 8;
             vstore();
         }
         break;