[clang] [flang] [flang][Driver] Let the linker fail on multiple definitions of main() (PR #73124)

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

> > LGTM, thank you for taking care of this 🙏🏻
> > Dare I ask - what's "dupes"? I only found 
> > [dupe](https://dictionary.cambridge.org/dictionary/english/dupe). Also, 
> > please wait for @kiranchandramohan to approve before merging this :)
> 
> I used "dupes" in the sense of being fooled. I can of course still change the 
> name to something like "main_linktime_duplicate.f90" or the likes.

Right, "dupes" wasn't that obvious to me :) I would probably go for your other 
suggestion or just plain "duplicate_main.f90". Either would be a bit more 
descriptive IMHO 🙏🏻 .

Thanks again for addressing my comments and for this contribution!

https://github.com/llvm/llvm-project/pull/73124
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