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

[Tom Eccles via cfe-commits]

tblah wrote:

That example is quite different because you used `program` in the fortran 
source. The use case here is applications which implement `main` in C then call 
into fortran code

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