bpo-28845: Clean up known issues for AIX (GH-1670)

Clean up `Misc/README.AIX` for addressed known issues.

- Issues that have been marked fixed: #11184, #11185
- Issues resolved by new AIX version: #1745108
- Issues resolved, but not yet marked fixed/closed: #11188
Signed-off-by: Eric N. Vander Weele <ericvw@gmail.com>

Misc/README.AIX

@@ -91,12 +91,6 @@ Those issues are currently affecting Python on AIX:
   consider using the provided patch that implements a custom malloc
   implementation
 
-* issue 11184: support for large files is currently broken
-
-* issue 11185: os.wait4 does not behave correctly with option WNOHANG
-
-* issue 1745108: there may be some problems with curses.panel
-
 * issue 11192: test_socket fails
 
 * issue 11190: test_locale fails
@@ -107,7 +101,6 @@ Those issues are currently affecting Python on AIX:
 
 * issue 11215: test_fileio fails
 
-* issue 11188: test_time fails
 
 
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