Without it, recent bindgen will give an error

   error: extern block cannot be declared unsafe

if rustc is not new enough to support the "unsafe extern" construct.

Cc: qemu-r...@nongnu.org
Cc: qemu-sta...@nongnu.org
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
 meson.build | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/meson.build b/meson.build
index 2c9ac9cfe1e..131b2225ab6 100644
--- a/meson.build
+++ b/meson.build
@@ -4054,6 +4054,9 @@ if have_rust
       bindgen_args += ['--formatter', 'none']
     endif
   endif
+  if bindgen.version().version_compare('>=0.66.0')
+    bindgen_args += ['--rust-target', '1.59']
+  endif
   if bindgen.version().version_compare('<0.61.0')
     # default in 0.61+
     bindgen_args += ['--size_t-is-usize']
-- 
2.48.1


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