[flang] [clang] [flang] Add depdendent-lib option to flang -fc1 on Windows (PR #72121)

[David Truby via cfe-commits]

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+! RUN: %flang_fc1 -emit-mlir -triple aarch64-pc-windows-msvc --dependent-lib=libtest %s -o - 2>&1 | FileCheck %s
+! RUN: %flang_fc1 -emit-mlir -triple x86_64-pc-windows-msvc --dependent-lib=libtest %s -o - 2>&1 | FileCheck %s
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DavidTruby wrote:

I changed to use this but I'm not sure it's actually any clearer than just listing the run lines. Let me know what you think now that I've put it in 👍 

https://github.com/llvm/llvm-project/pull/72121