minor, import yuck.m4

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, check for installed yuck through yuck.m4's AX_CHECK_YUCK, default to the included version though

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

* bld/dist:
  chore, check for installed yuck through yuck.m4's AX_CHECK_YUCK, default to the included version though
  minor, import yuck.m4