test_analyze_wheel_abi: add failing test case

Add a failing test case confiring that environment is not being
correctly reset.

Author: xnox

tests/integration/test_bundled_wheels.py

@@ -59,6 +59,12 @@
             frozenset([f"{HERE}/*"]),
             "LD_LIBRARY_PATH",
         ),
+        (
+            "cffi-1.5.0-cp27-none-linux_x86_64.whl",
+            {"libffi.so.5", "libpython2.7.so.1.0"},
+            frozenset([f"{HERE}/*"]),
+            None,
+        ),
         (
             "cffi-1.5.0-cp27-none-linux_x86_64.whl",
             {"libpython2.7.so.1.0"},