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2eb9e18f - libtextstyle: Protect better against EINTR.

libtextstyle: Protect better against EINTR. * gnulib-local/lib/fd-ostream.oo.c (nonintr_tcdrain): New function. (fd_ostream::flush): Use it instead of tcdrain. * gnulib-local/lib/file-ostream.oo.c: Include <errno.h>. (nonintr_tcdrain): New function. (file_ostream::flush): Use it instead of tcdrain. * gnulib-local/lib/term-ostream.oo.c (nonintr_tcdrain): New function. (term_ostream::flush): Use it instead of tcdrain.