Fix Indian time zone test when run by Irishmen (bug#45818)

* test/lisp/calendar/solar-tests.el (solar-sunrise-sunset):
Inhibit any attempt by confused calendar code to apply daylight saving
correction when Irish time zone settings are in effect.  It's not
entirely clear why this is needed but may be related to the fact that
'IST' stands for both Irish and Indian Standard Time, and that Ireland
uses reversed daylight saving in winter.
2 jobs for master in 36 minutes and 48 seconds (queued for 2 seconds)
Status Job ID Name Coverage
failed #10056


passed #10057


Name Stage Failure
test-filenotify-gio Test
Ran 20 tests, 18 results as expected, 0 unexpected, 2 skipped (2021-01-13 12:54:35+0000, 97.184860 sec)

2 skipped results:
SKIPPED file-notify-test10-sufficient-resources
SKIPPED file-notify-test10-sufficient-resources-remote

make[1]: Leaving directory '/builds/emacs/emacs/test'
make: Leaving directory '/builds/emacs/emacs/test'
ERROR: Job failed: exit code 1