fix zstd_shared detection on mingw (#139945) The zstd_shared autodetection was broken for non-MSVC (mingw) compiled LLVM, since it assumed that `*.a` uniquely identifies a file as being a static library, but typically this is actually an import lib formed as the longer name `*.dll.a` from the binary. This leads to confusing output elsewhere, in cmake and llvm-config, when they report this is a static library at an absolute path instead of a shared library named `-lzstd`.
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