macdeploy: disable compression in macOS gen-sdk script

Starting with Python 3.11, Pythons gzip might delegate to zlib.
Depending on the OS, i.e Ubuntu vs Fedora, the underlying zlib
implementation might differ, resulting in different output.

For now, or until a better solution exists, disable compression. This
results in the SDK increasing in size to ~157mb. Which is not
unreasonable, to regain determinism (and would be significantly worse
without the previous commit).

See: https://docs.python.org/3/library/gzip.html#gzip.compress

Co-authored-by: stickies-v <stickies-v@protonmail.com>

contrib/guix/README.md

@@ -37,7 +37,7 @@ You can then either point to the SDK using the `SDK_PATH` environment variable:
 
 ```sh
 # Extract the SDK tarball to /path/to/parent/dir/of/extracted/SDK/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers
-tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar.gz
+tar -C /path/to/parent/dir/of/extracted/SDK -xaf /path/to/Xcode-<foo>-<bar>-extracted-SDK-with-libcxx-headers.tar
 
 # Indicate where to locate the SDK tarball
 export SDK_PATH=/path/to/parent/dir/of/extracted/SDK