only for the paranoid---getgroups(3) testcase

[Roland Illig]

Here's a little testcase that can be used for confidence tests and for 
portability tests.

You can define FIRST_GETGROUPS_FAILS and/or SECOND_GETGROUPS_FAILS and 
see what's the result.

In addition to the code used in utilunix.c, there's a check that the 
result of the second call to getgroups() is not greater than the result 
of the first call.

There is no check whether the getgroups() function produces a buffer 
overflow. This is left as an excercise to the reader.

Roland
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