[bug #65792] Improve support for file birth time

Follow-up Comment #1, bug #65792 (group findutils):

Perhaps it makes sense to add a function in Gnulib that allows fetching the
creation-time of a file?

On the BSDs you can use struct stat to get the birthtime [1].

Linux has statx as you mentioned [2].

Windows (not sure if Findutils supports it) through GetFileTime [3].

From what I can tell AIX and Solaris don't have any way to get it.

Maybe a wrapper function around stat with an extra argument?

extern int stat_birthtime (const char *file, struct stat *st, struct timespec
*birthtime);

[2] https://man.freebsd.org/cgi/man.cgi?query=stat&sektion=2
[2] https://man7.org/linux/man-pages/man2/statx.2.html
[3]
https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-getfiletime


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