minor, bring back dump mode to tzmap show, without arguments

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'feat/iata-zones'

* feat/iata-zones:
  minor, bring back dump mode to tzmap show, without arguments
fix, PEBKAC, don't redefine tzmap_CPPFLAGS

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, import .tzminfo dummy files and rule to obtain .tzmaps from the github server

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, also compile and install tzmcc files

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
Merge branch 'bld/tzmaps'

* bld/tzmaps:
  chore, also compile and install tzmcc files
  chore, import .tzminfo dummy files and rule to obtain .tzmaps from the github server
  fix, PEBKAC, don't redefine tzmap_CPPFLAGS