codespell: fix typo

Author: mara004

setupsrc/pypdfium2_setup/build_native.py

@@ -388,7 +388,7 @@ def parse_args(argv):
     )
     # The --vendor option is provided for cibuildwheel clients:
     # - libicudata pulled in from the system via `auditwheel repair` is quite big. Using vendored ICU reduces wheel size by about 10 MB (compressed).
-    # - libc++ is used but not pulled in by auditwheel. This appears to be ABI-unsafe (although the wheels seem to work accross different hosts according to downstream feedback), so we may want to add that in the future. Actually, options to use system libc++ are deprecated upstream anyway.
+    # - libc++ is used but not pulled in by auditwheel. This appears to be ABI-unsafe (although the wheels seem to work across different hosts according to downstream feedback), so we may want to add that in the future. Actually, options to use system libc++ are deprecated upstream anyway.
     parser.add_argument(
         "--vendor",
         dest = "vendor_deps",