rust: disable overflow-checks by default

These result in very large binaries when linked, and are not generally
useful. A user can turn them back on by passing `-C overflow-checks=yes`
manually via `-Drust_args` or the `RUSTFLAGS` environment variable

fixes: mesonbuild#11785

mesonbuild/compilers/rust.py

@@ -217,7 +217,7 @@ def get_pie_args(self) -> T.List[str]:
 
     def get_assert_args(self, disable: bool) -> T.List[str]:
         action = "no" if disable else "yes"
-        return ['-C', f'debug-assertions={action}']
+        return ['-C', f'debug-assertions={action}', '-C', 'overflow-checks=no']
 
 
 class ClippyRustCompiler(RustCompiler):