[flang] [clang] [flang][driver] Add -fno-fortran-main (link time) option to remove Fortran_main from link line (PR #74139)

[Michael Klemm via cfe-commits]

mjklemm wrote:

@DavidTruby If you are OK with the way I handled MSVC, please approve and I will merge the PR (or change it if you want some changes to be made).

https://github.com/llvm/llvm-project/pull/74139