gnu: python: Make the build reproducible.

While Python build was reproducible on a single machine, once multiple file
systems entered the picture, it was no longer true.  The solution adopted by
the upstream (and Debian) was cherry-picked.

More info: <https://github.com/python/cpython/pull/8226>.

* gnu/packages/python.scm (python-3.10) [source]: Apply reproducibility patch.

Signed-off-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Modified-by: Maxim Cournoyer <maxim.cournoyer@gmail.com>
Change-Id: I0273dc0f8511a7acdcc2b462a26cc29a9756c801

gnu/packages/python.scm

@@ -435,6 +435,7 @@ data types.")
                         "python-3-deterministic-build-info.patch"
                         "python-3-fix-tests.patch"
                         "python-3-hurd-configure.patch"
+                        "python-3-reproducible-build.patch"
                         "python-3-search-paths.patch"))
               (sha256
                (base32