runtime-compile timezones instead of loading them all

Rev: lib/modules/Calendar.pmod/Ruleset.pike:1.2
Rev: lib/modules/Calendar.pmod/Time.pmod:1.2
Rev: lib/modules/Calendar.pmod/TimeRanges.pmod:1.2
Rev: lib/modules/Calendar.pmod/Timezone.pmod:1.2
Rev: lib/modules/Calendar.pmod/module.pmod:1.2
Rev: lib/modules/Calendar.pmod/tzdata/africa:1.1
Rev: lib/modules/Calendar.pmod/tzdata/antarctica:1.1
Rev: lib/modules/Calendar.pmod/tzdata/asia:1.1
Rev: lib/modules/Calendar.pmod/tzdata/australasia:1.1
Rev: lib/modules/Calendar.pmod/tzdata/backward:1.1
Rev: lib/modules/Calendar.pmod/tzdata/etcetera:1.1
Rev: lib/modules/Calendar.pmod/tzdata/europe:1.1
Rev: lib/modules/Calendar.pmod/tzdata/factory:1.1
Rev: lib/modules/Calendar.pmod/tzdata/iso3166.tab:1.1
Rev: lib/modules/Calendar.pmod/tzdata/leapseconds:1.1
Rev: lib/modules/Calendar.pmod/tzdata/northamerica:1.1
Rev: lib/modules/Calendar.pmod/tzdata/pacificnew:1.1
Rev: lib/modules/Calendar.pmod/tzdata/solar87:1.1
Rev: lib/modules/Calendar.pmod/tzdata/solar88:1.1
Rev: lib/modules/Calendar.pmod/tzdata/solar89:1.1
Rev: lib/modules/Calendar.pmod/tzdata/southamerica:1.1
Rev: lib/modules/Calendar.pmod/tzdata/systemv:1.1
Rev: lib/modules/Calendar.pmod/tzdata/yearistype.sh:1.1
Rev: lib/modules/Calendar.pmod/tzdata/zone.tab:1.1