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

[Andrzej Warzyński via cfe-commits]

banach-space wrote:

Could folks confirm whether this fixes the issue on Darwin: 
https://github.com/llvm/llvm-project/pull/75393?

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