Replaced custom deprecated decorator with simple DeprecationWarning (#2110)

tests/regress/test_old_ctl.py

@@ -1,14 +1,18 @@
 import regress
+import sys
+import unittest
 from unicorn import *
 from unicorn.x86_const import *
 
+
 # Very basic testing to ensure the old api exists
-# and we correctly implement __deprecated
+@unittest.skipIf(sys.version_info < (3, 7), reason="requires python3.7 or higher")
 class OldCtl(regress.RegressTest):
     def runTest(self):
         mu = Uc(UC_ARCH_X86, UC_MODE_32)
         mu.ctl_tlb_mode(UC_TLB_CPU)
         mu.ctl_set_tlb_mode(UC_TLB_VIRTUAL)
 
+
 if __name__ == '__main__':
     regress.main()