Fix I/O-protocol handling in eunit

Hi,

Some io_requests, getopts, {get_geometry, rows} and {get_geometry, columns}
in eunit raises unexpected error.

For example,

$ cat my_tests.erl
-module(my_tests).
-include_lib("eunit/include/eunit.hrl").

my_test() ->
  io:getopts().

1> c(my_tests).
{ok,my_tests}
2> eunit:test(my_tests).
my_tests: my_test (module 'my_tests')...*skipped*
undefined
*unexpected termination of test process*
::{{badmatch,{error,{error,enotsup},[]}},
   [{eunit_proc,io_request,4,[{file,"eunit_proc.erl"},{line,614}]},

 {eunit_proc,group_leader_loop,3,[{file,"eunit_proc.erl"},{line,584}]}]}

       =======================================================
         Failed: 0.  Skipped: 0.  Passed: 0.
         One or more tests were cancelled.
         error
         3>
         =ERROR REPORT==== 11-May-2013::05:51:35 ===
         Error in process <0.49.0> with exit value:
{{badmatch,{error,{error,enotsup},[]}},[{eunit_proc,io_request,4,[{file,"eunit_proc.erl"},{line,614}]},{eunit_proc,group_leader_loop,3,[{file,"eunit_proc.erl"},{line,584}]}]}


git fetch [email protected]:mururu/otp.git fix_eunit_io_protocol
https://github.com/mururu/otp/compare/erlang:maint...fix_eunit_io_protocol
https://github.com/mururu/otp/compare/erlang:maint...fix_eunit_io_protocol.patch

Thanks.

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