Fix _testinternalcapi build

Summary:
After the test interpreter landed our _testinternalcapi build succeeds but is missing a symbol because `interpreter.c` isn't included. To include we need access to CPython's headers in Python and sdt.

Once this is fixed we see new failures in `test.test_opcache` because a couple of new tests have trickled in where specialization doesn't work with the JIT.

Reviewed By: alexmalyshev

Differential Revision: D91243622

fbshipit-source-id: 891e9558adc2d098d688364789602d15f90103d6

Author: DinoV

cinderx/TestScripts/cinder_jit_ignore_tests.txt

@@ -149,6 +149,8 @@ test.test_dis.DisWithFileTests.test_loop_with_conditional_at_end_is_quickened
 test.test_dis.DisWithFileTests.test_super_instructions
 test.test_opcache.TestCallCache.test_assign_init_code
 test.test_opcache.TestCallCache.test_push_init_frame_fails
+test.test_opcache.TestCallCache.test_specialize_call_function_ex_py
+test.test_opcache.TestCallCache.test_specialize_call_function_ex_py_fail
 test.test_opcache.TestRacesDoNotCrash.*
 test.test_opcache.TestSpecializer.*
 test.test_type_cache.TypeCacheWithSpecializationTests.test_class_call_specialization_user_type