Tested with MSVC. It is now easier to diagnose problems:
2021-06-20 23:57:28 us=812000 get_console_input_win32(): unexpected
error: No such device or address (errno=6)
2021-06-20 23:57:28 us=812000 ERROR: Failed retrieving username or password
2021-06-20 23:57:28 us=812000 Exiting due to fatal err
When the function setup fails due to invalid file handles, or because
WriteFile(err, ...) fails (due to file handle corruption elsewhere),
the function used to silently "return false"
Change this to print a M_WARN|M_ERRNO message.
Also, change the function style to early-return style (= large dif
