[6.0][wasm] Cherry-pick errno platform overlay fixes
#75798
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We provide shims for errno constants in WASILibc overlay since wasi-libc's errno.h defines those constants in a way that cannot be imported by ClangImporter. However, some errno constants are aliased in wasi-libc, and we didn't provided shims for them. This patch adds those missing shims.
This commit fixes an ambiguous `errno` error when importing WASILibc module and SwiftWASILibc Clang module. The error is caused by the fact that we define a shim for `errno` in `Platform.swift` file, but wasi-libc defines `errno` in a way ClangImporter can understand. We don't need to define shims for it, otherwise we get two candidates for `errno` identifier.
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bnbarham
approved these changes
Aug 9, 2024
MaxDesiatov
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WASILibcoverlay issues.errnoerror when importing WASILibc module #75747