chore, provide conditional on whether tzmaps are bundled already

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, if tzmaps are bundled do compile and install them

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, run a test that actually counts the hits for HAVE_TZMAPS conditional

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

* bld/dist:
  chore, run a test that actually counts the hits for HAVE_TZMAPS conditional
  minor, if tzmaps are bundled do compile and install them
  chore, provide conditional on whether tzmaps are bundled already
hygiene, provide safety net for passing NULL to dt_io_zone()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, support zone-aware grepping in dgrep(1)

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
test, provide regression tests for dgrep's zone awareness

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

* feat/dgrep-zone-options:
  test, provide regression tests for dgrep's zone awareness
  minor, support zone-aware grepping in dgrep(1)
  hygiene, provide safety net for passing NULL to dt_io_zone()