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* Make slang-llvm fetching and failure more robust
Improve error reporting when things go wrong.
Fall back by default to a non-llvm build
Closes https://github.com/shader-slang/slang/issues/5247
Tested sensible behavior with:
- `FETCH_BINARY_IF_POSSIBLE`, valid tag
- No errors or warnings, successful build with llvm
- `FETCH_BINARY_IF_POSSIBLE`, no valid tag
- Warning message, successful llvm build with slang-llvm from latest release
- `FETCH_BINARY_IF_POSSIBLE`, no valid tag, bad `SLANG_SLANG_LLVM_BINARY_URL` specified
- Warning message, successful no-llvm build
- `FETCH_BINARY_IF_POSSIBLE`, no valid tag, unable to fetch release information
- Warning message, successful no-llvm build
- `FETCH_BINARY`, valid tag
- No errors or warnings, successful build with llvm
- `FETCH_BINARY`, no valid tag
- Warning message, successful llvm build with slang-llvm from latest release
- `FETCH_BINARY`, no valid tag, bad `SLANG_SLANG_LLVM_BINARY_URL` specified
- Error, explaining that we couldn't fetch it
- `FETCH_BINARY`, no valid tag, unable to fetch release info
- Error, explaining that we couldn't fetch it
* Allow downloading from a local file
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Co-authored-by: Yong He <yonghe@outlook.com>
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