Fix emacsclient hang when backgrounded
Problem reported by Kaushal Modi in: https://lists.gnu.org/r/emacs-devel/2018-12/msg00083.html The tcdrain call replaced an fdatasync call which had no effect on the tty, so removing it entirely shouldn’t cause problems. The fdatasync call replaced an fsync call which also had no effect on the tty, and the fsync call seems to be badly-merged revenant of emacsclient’s old (circa 2004) way of communicating to and from Emacs via FILE * streams, where fsync was apparently needed when talking to sockets. * lib-src/emacsclient.c [!DOS_NT]: Don’t include termios.h. (flush_stdout): Remove. All callers removed. (main): Do not drain the tty after "Waiting for Emacs..." message. There should be no need to drain, and draining it might send us a SIGTTOU. Do not fflush stdout just before exiting, as exiting does that for us.
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