Enable test_fcntl

Author: BCSharp

tests/IronPython.Tests/Cases/CPythonCasesManifest.ini

@@ -400,11 +400,6 @@ Ignore=true
 [CPython.test_faulthandler]
 Ignore=true
 
-[CPython.test_fcntl]
-RunCondition=$(IS_POSIX)
-Ignore=true
-Reason=ImportError: No module named fcntl
-
 [CPython.test_file]
 IsolationLevel=PROCESS # https://github.com/IronLanguages/ironpython3/issues/489
 
@@ -514,7 +509,7 @@ Ignore=true
 [CPython.test_ioctl]
 RunCondition=$(IS_POSIX)
 Ignore=true
-Reason=unittest.case.SkipTest: No module named 'fcntl'
+Reason=unittest.case.SkipTest: module 'termios' has no attribute 'TIOCGPGRP', 'fcntl.ioctl' is a mock
 
 [CPython.test_ipaddress]
 Ignore=true
@@ -724,7 +719,7 @@ Ignore=true
 [CPython.test_pty]
 RunCondition=$(IS_POSIX)
 Ignore=true
-Reason=unittest.case.SkipTest: No module named 'fcntl'
+Reason=Missing constants in 'termios', 'signal', 'termios' implementation is a stub
 
 [CPython.test_pulldom]
 Ignore=true