libstdc++: Add dg-timeout-factor to <chrono> IO tests
This avoids failures due to compilation timeouts when testing with a low
tool_timeout value.
libstdc++-v3/ChangeLog:
* testsuite/20_util/duration/io.cc: Double timeout using
dg-timeout-factor.
* testsuite/std/time/day/io.cc: Likewise.
* testsuite/std/time/format.cc: Likewise.
* testsuite/std/time/hh_mm_ss/io.cc: Likewise.
* testsuite/std/time/month/io.cc: Likewise.
* testsuite/std/time/month_day/io.cc: Likewise.
* testsuite/std/time/month_day_last/io.cc: Likewise.
* testsuite/std/time/month_weekday/io.cc: Likewise.
* testsuite/std/time/month_weekday_last/io.cc: Likewise.
* testsuite/std/time/weekday/io.cc: Likewise.
* testsuite/std/time/weekday_indexed/io.cc: Likewise.
* testsuite/std/time/weekday_last/io.cc: Likewise.
* testsuite/std/time/year/io.cc: Likewise.
* testsuite/std/time/year_month/io.cc: Likewise.
* testsuite/std/time/year_month_day/io.cc: Likewise.
* testsuite/std/time/year_month_day_last/io.cc: Likewise.
* testsuite/std/time/year_month_weekday/io.cc: Likewise.
* testsuite/std/time/year_month_weekday_last/io.cc: Likewise.
* testsuite/std/time/zoned_time/io.cc: Likewise.
19 files changed: