Create symbolic link man to gnuman

[moonfruit]

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For compatible, I simply create symbolic link man which point to gnuman instead of rename it.
Fix #35310.

[fxcoudert]

We don't need the revision bumps, since the content is otherwise unchanged. Other than that, it's OK.

[fxcoudert]

Sorry, forgot something else: please make it 1 commit per formula. It makes history easier.

[moonfruit]

OK, I will change it.

[apjanke]

Clever. I tested this out, and it seems to work as intended: when I put the gnubin directory for e.g. sed on my path ahead of /usr/bin, then man sed picks up the GNU man page to correspond to it.

[fxcoudert]

Thanks @moonfruit