gh-81057: Add a CI Check for New Unsupported C Global Variables (gh-102506)

This will keep us from adding new unsupported (i.e. non-const) C global variables, which would break interpreter isolation.

FYI, historically it is very uncommon for new global variables to get added. Furthermore, it is rare for new code to break the c-analyzer. So the check should almost always pass unnoticed.

Note that I've removed test_check_c_globals. A test wasn't a great fit conceptually and was super slow on debug builds. A CI check is a better fit.

This also resolves gh-100237.

https://github.com/python/cpython/issues/81057

.github/workflows/build.yml

@@ -111,6 +111,9 @@ jobs:
         run: make smelly
       - name: Check limited ABI symbols
         run: make check-limited-abi
+      - name: Check for unsupported C global variables
+        if: github.event_name == 'pull_request'  # $GITHUB_EVENT_NAME
+        run: make check-c-globals
 
   build_win32:
     name: 'Windows (x86)'