chore, list fmt-special as EXTRA_ltrcc_SOURCE

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, make GPERF var default to gperf

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

* bld/dist:
  fix, make GPERF var default to gperf
  chore, list fmt-special as EXTRA_ltrcc_SOURCE