chore, update to latest (AIX friendly) yuck version

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, determine m4 flavour during configure (in AX_CHECK_YUCK)

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, actually use the m4 flavour determined by AX_CHECK_YUCK

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, polish yuck boostrapping so it runs on AIX

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

* feat/go-yuck:
  minor, polish yuck boostrapping so it runs on AIX
  chore, actually use the m4 flavour determined by AX_CHECK_YUCK
  minor, determine m4 flavour during configure (in AX_CHECK_YUCK)
  chore, update to latest (AIX friendly) yuck version