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5408a55fc8Consolidate Win32-specific error formatting (John Moffett)c95a4432d7Show descriptive error messages when FileCommit fails (John Moffett) Pull request description: Only raw [`errno`](https://en.cppreference.com/w/cpp/error/errno) int values are logged if `FileCommit` fails. These values are implementation-specific, so it makes it harder to debug based on user reports. For instance, https://github.com/bitcoin/bitcoin/issues/26455#issue-1436654238 and [another](https://bitcointalk.org/index.php?topic=5182526.0#:~:text=FileCommit%3A%20FlushFileBuffers%20failed%3A%205). Instead, use `SysErrorString` (or the refactored Windows equivalent `Win32ErrorString`) to display both the raw int value and the descriptive message. All other instances in the code I could find where `errno` or (Windows-only) `GetLastError()`/`WSAGetLastError()` are logged use the full descriptive string. For example:1b680948d4/src/util/sock.cpp (L390)1b680948d4/src/util/sock.cpp (L272)7e1007a3c6/src/netbase.cpp (L515-L516)8ccab65f28/src/init.cpp (L164)I refactored the Windows formatting code to put it in `syserror.cpp`, as it's applicable to all Win32 API system errors, not just networking errors. To be clear, the Windows API functions `WSAGetLastError()` and `GetLastError()` are currently [equivalent](https://stackoverflow.com/questions/15586224/is-wsagetlasterror-just-an-alias-for-getlasterror). ACKs for top commit: MarcoFalke: lgtm ACK5408a55fc8💡 Tree-SHA512: 3921cbac98bd9edaf84d3dd7a43896c7921f144c8ca2cde9bc96d5fb05281f7c55e7cc99db8debf6203b5f916f053025e4fa741f51458fe2c53bb57b0a781027