Fix Locales.t in 5.24.1

[djzort]

2020 broke the Locales.t tests

I provided a patch for 5.24.1 to the nice people who package perl for debian at https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=915209

[djzort]

#10 might be related

[djzort]

Ok i was going to do a PR but having the diff in the code seems tricky.