This reverts commit 2d4da30fde.
This Gnulib update was causing failures related to timezones in
stime.c. I tried to fix it by adopting the time_rz module from gnulib
but that then caused other failures. We can try again later.
Should fix fport_input_waiting when neither poll nor select nor FIONREAD
are available, which is the case on MinGW. Thanks to Eli Zaretskii for
the report.