meson/rust: allow "needless lifetimes"

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/38807>

meson.build

@@ -824,6 +824,10 @@ if with_gallium_rusticl or with_nouveau_vk or with_tools.contains('etnaviv') or
     # We want to be able to write `else { if {} }` when it makes more sense than
     # collapsing it into `else if {}`.
     '-Aclippy::collapsible_else_if',
+
+    # "Needless lifetimes" might be needless but they're harmless and we
+    # prefer being explicit, so allow them.
+    '-Aclippy::needless_lifetimes',
   ]
 
   rust_2024_lint_args = [