Cygwin version detection at run time

[Václav Haisman]

Hi.

I am trying to find out Cygwin version at run time.

I have noticed that there is `cygwin_internal (CW_GETVERSIONINFO)` API
for this. However, it seems that the `cygwin_version_info` structure
this call is supposed to fill in is not publicly available and is only
declared internally in `winsup/cygwin/cygwin_version.h`.

Am I right that my only option is either to copy the internal
declaration of the structure or to use `/proc/version` and parse the
version string out of that?

-- 
VH

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