Broken bootstrap of gcc on cygwin in gengtype

[Kai Tietz]

Hello,

I noticed a seg-fault in gengtype on cygwin bootstap. Guilty seem to be, 
that in method "oprintf" the standard c-library call "vsnprintf" is used, 
which is on MSVCRT broken. By a patching it to use vasnprintf it seems to 
work. Did somebody noticed this problem too ?

Regards,
 i.A. Kai Tietz

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