Merge branch 'ef/mingw-tty-getpass'

Update getpass() emulation for MinGW. * ef/mingw-tty-getpass: mingw: get rid of getpass implementation mingw: reuse tty-version of git_terminal_prompt compat/terminal: separate input and output handles compat/terminal: factor out echo-disabling mingw: make fgetc raise SIGINT if apropriate mingw: correct exit-code for SIGALRM's SIG_DFL