Add support for MS-Windows using the MSYS2/CLANG64 toolchain

[ikappaki]

Hi,

could you please consider adding support for Windows using the MSYS2/clang64 toolchain in support of #713.

The port requires updates to the following third-party libraries:

1. CppInterop: Support CppInterop on MSYS2/CLANG64 toolchain CppInterOp#3
2. Folly: Support folly on MSYS2/CLANG64 toolchain folly#2
3. Zip: Support zip on MSYS2/CLANG64 toolchain#2 zip#2

It also introduces the (libchkstk (is a simple workaround for the Symbols not found: [ ___chkstk_ms ] build error) and MINGW-packages/mingw-w64-llvm (a package definition extracted, with the necessary patches to compile on the MSYS2 clang64 toolchain), under the third-party libraries, with their original snapshots from source starting at:
#714

The port is fully functional except for exception stack unwinding from the JIT layer, which is not yet supported by LLVM (tracked in ikappaki#2). As a result, several tests that throw exceptions from JIT code have been explicitly disabled:

• jank-test: as listed in compiler+runtime/test/jit_windows_skips.txt
• compiler+runtime/test/bash/clojure.test/src/clojure_test/self_test.jank
• compiler+runtime/test/bash/error-reporting/bin/jank/test/error_reporting.clj
• compiler+runtime/test/bash/cli/pass-test

I will update the documentation once the review process is complete. We should also consider how to approach binary packaging, since there is currently no registry available to host mingw-w64-jank alpha binaries.

I also plan to update this description with a bullet point summary of the changes.

Thanks

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✅ ikappaki
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