my_tzinfo test fails with musl-libc

Executing the my_tzinfo testsuite in a system that is using musl-libc instead of glibc will fail:

root@qemux86-64:/usr/lib/mariadb/ptest# ./unittest/mysys/my_tzinfo-t
1..38
ok 1 # skip no test for default timezone name UTC
ok 2 - GMT offset is whole number of minutes 0
ok 3 - UTC: Offset for timestamp 1690000000 is 0/0
ok 4 - tz abbreviation UTC
ok 5 - GMT offset is whole number of minutes 0
ok 6 - UTC: Offset for timestamp 1700000000 is 0/0
ok 7 - tz abbreviation UTC
ok 8 - GMT offset is whole number of minutes 0
ok 9 - UTC: Offset for timestamp 1762356793 is 0/0
ok 10 - tz abbreviation UTC
ok 11 - PST8PDT: timezone_name = PDT
ok 12 - PST8PDT: Summer GMT offset -25200
ok 13 - PST8PDT: Offset for timestamp 1690000000 is -25200/-25200
ok 14 - PST8PDT: Summer time abbreviation PDT
not ok 15 - PST8PDT: Winter GMT offset -25200
ok 16 - PST8PDT: Offset for timestamp 1700000000 is -25200/-25200
not ok 17 - PST8PDT: Winter time abbreviation PDT
ok 18 - GMT: timezone_name = GMT
ok 19 - GMT: Summer GMT offset 0
ok 20 - GMT: Offset for timestamp 1690000000 is 0/0
ok 21 - GMT: Summer time abbreviation GMT
ok 22 - GMT: Winter GMT offset 0
ok 23 - GMT: Offset for timestamp 1700000000 is 0/0
ok 24 - GMT: Winter time abbreviation GMT
ok 25 - GST-1GDT: timezone_name = GDT
ok 26 - GST-1GDT: Summer GMT offset 7200
ok 27 - GST-1GDT: Offset for timestamp 1690000000 is 7200/7200
ok 28 - GST-1GDT: Summer time abbreviation GDT
not ok 29 - GST-1GDT: Winter GMT offset 7200
ok 30 - GST-1GDT: Offset for timestamp 1700000000 is 7200/7200
not ok 31 - GST-1GDT: Winter time abbreviation GDT
ok 32 - IST-5:30: timezone_name = IST
ok 33 - IST-5:30: Summer GMT offset 19800
ok 34 - IST-5:30: Offset for timestamp 1690000000 is 19800/19800
ok 35 - IST-5:30: Summer time abbreviation IST
ok 36 - IST-5:30: Winter GMT offset 19800
ok 37 - IST-5:30: Offset for timestamp 1700000000 is 19800/19800
ok 38 - IST-5:30: Winter time abbreviation IST

1. Failed 4 tests!

I asked the musl developers about this, and they claim that glibc is handling these posix timezones incorrectly. If I prefix the posix timezones in the test source with a colon ":", then these tests succeed, but some others start to fail.