[llvm] [llvm-jitlink] Explicit exports for builtin runtime functions in MinGW executables (PR #107375)

[Stefan Gränitz via llvm-commits]

weliveindetail wrote:

In fact, we hit the same symbol export problem in MSVC builds and we can apply the same fix. So, I am generalizing this to WIN32.

https://github.com/llvm/llvm-project/pull/107375