_mcleanup is called twice in forkee!

[jojelino]

When a program is compiled with -pg, it causes invocation of _monstartup 
and it calls atexit, the problem is, _mcleanup is called twice in forkee!
That's because of _GLOBAL_REENT is copied when a process is forked.
Then we have two _mcleanup. (_monstartup is with __constructor__ 
attribute.) and this is not we wanted.
the same thing can be applied to any atexit call in cygwin which doesn't 
cares about forkee.


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