sagemathgh-36552: src/sage/misc/cython.py: Fix the workaround for s…

…etuptools_scm

<!-- ^^^^^
Please provide a concise, informative and self-explanatory title.
Don't put issue numbers in there, do this in the PR body below.
For example, instead of "Fixes sagemath#1234" use "Introduce new method to
calculate 1+1"
-->
<!-- Describe your changes here in detail -->

<!-- Why is this change required? What problem does it solve? -->
The part of sagemath#36400 that was intended to fix the runtime use of cython
did not actually fix it because `finalize_distribution` is called
already by `Distribution.__init__`.

This shows up when invoked from a directory with `pyproject.toml` or a
similar config file. As the Build & Test workflow invokes the doctester
from `SAGE_ROOT/src`, these errors show up in all tests. Marking it as a
blocker so it is [applied automatically in CI
workflows](https://github.com/sagemath/sage/wiki/Sage-10.2-Release-
Tour#open-blocker-prs-are-applied-automatically-in-ci-workflows)

<!-- If this PR resolves an open issue, please link to it here. For
example "Fixes sagemath#12345". -->
Fixes
sagemath#36400 (comment)
<!-- If your change requires a documentation PR, please link it
appropriately. -->

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->
<!-- If your change requires a documentation PR, please link it
appropriately -->
<!-- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->
<!-- Feel free to remove irrelevant items. -->

- [x] The title is concise, informative, and self-explanatory.
- [ ] The description explains in detail what this PR is about.
- [x] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [ ] I have updated the documentation accordingly.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on
- sagemath#12345: short description why this is a dependency
- sagemath#34567: ...
-->

<!-- If you're unsure about any of these, don't hesitate to ask. We're
here to help! -->

URL: sagemath#36552
Reported by: Matthias Köppe
Reviewer(s): Tobias Diez

build/pkgs/configure/checksums.ini

@@ -1,4 +1,4 @@
 tarball=configure-VERSION.tar.gz
-sha1=aa7054a0e6a582d2db1475dc47f63a54e6ac569f
-md5=40eab024557ad51e08dfb08e2753a465
-cksum=802824779
+sha1=2e10c6289199a61f8bcf7223187d1c73941e7cf7
+md5=8ed9a9b76fe5ced09e60a2ea9f796cb4
+cksum=2516922817

build/pkgs/configure/package-version.txt

@@ -1 +1 @@
-c47788b02a42ef4907a0e61e702fbe9bbef27590
+ab10fe939823febb1f5c3d14400f143631b84f81

src/sage/misc/cython.py

@@ -421,15 +421,20 @@ def cython(filename, verbose=0, compile_message=False,
                         os.curdir)
 
     # This emulates running "setup.py build" with the correct options
-    dist = Distribution()
+    #
     # setuptools plugins considered harmful:
     # If build isolation is not in use and setuptools_scm is installed,
     # then its file_finders entry point is invoked, which we don't need.
     # And with setuptools_scm 8, we get more trouble:
     # LookupError: pyproject.toml does not contain a tool.setuptools_scm section
     # LookupError: setuptools-scm was unable to detect version ...
     # We just remove all handling of "setuptools.finalize_distribution_options" entry points.
-    dist._removed = staticmethod(lambda ep: True)
+    class Distribution_no_finalize_distribution_options(Distribution):
+        @staticmethod
+        def _removed(ep):
+            return True
+
+    dist = Distribution_no_finalize_distribution_options()
     dist.ext_modules = [ext]
     dist.include_dirs = includes
     buildcmd = dist.get_command_obj("build")