pythongh-115142: Skip test_capi/test_opt.py if _testinternalcapi is not available (pythonGH-117574)

Author: Eclips4

Lib/test/test_capi/test_opt.py

@@ -6,9 +6,10 @@
 import os
 
 import _opcode
-import _testinternalcapi
 
-from test.support import script_helper, requires_specialization
+from test.support import script_helper, requires_specialization, import_helper
+
+_testinternalcapi = import_helper.import_module("_testinternalcapi")
 
 from _testinternalcapi import TIER2_THRESHOLD