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ba13fa2a5d
LLVM is inconsistent about how it converts `errno` to `std::error_code`. This can cause problems because values outside of `std::errc` compare differently if one is system and one is generic on POSIX systems. This is even more of a problem on Windows where use of the system category is just wrong, as that is for Windows errors, which have a completely different mapping than POSIX/generic errors. This patch fixes one instance of this mistake in `JSONTransport.cpp`. This patch adds `errnoAsErrorCode()` which makes it so people do not need to think about this issue in the future. It also cleans up a lot of usage of `errno` in LLVM and Clang.