gh-109045: Remove remaining LIMITED_API_AVAILABLE checks in tests by andersk · Pull Request #109046 · python/cpython

Commit 13a0007 (python#108663) made all
Python builds compatible with the Limited API, and removed the
LIMITED_API_AVAILABLE flag.  However, some tests were still checking
for that flag, so they were now being incorrectly skipped.  Remove
these checks to let these tests run again.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>