[tz] zic changes (2/2)

[Paul Eggert]

The TZ string "PST+8PDT" doesn't conform to POSIX, and it isn't the name 
of a tzdata file. Traditionally the GNU C library attempts to interpret 
ruleless TZ strings by applying the daylight-saving rules of the GNU 
project headquarters in Cambridge, MA. It does this by combining the 
specified UTC offset (here, -08) with the DST rules taken from the file 
"America/New_York". Apparently this combination isn't working for the 
new-format tzdata files. My guess is that it's a glibc bug but I haven't 
investigated the details. You might also try using a valid POSIX string, 
or a valid tzdata string, and checking whether the bug also occurs in 
these more-important cases.