minor, spin-off bootstrapping rules into yuck.mk

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, spin-off automake rules into yuck.am

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, provide custom CPPFLAGS to yuck's convenience include

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

* bld/dist:
  minor, provide custom CPPFLAGS to yuck's convenience include
  minor, spin-off automake rules into yuck.am
  minor, spin-off bootstrapping rules into yuck.mk
minor, follow Alexandre Duret-Lutz' advice to predefine vars that get fiddled with in yuck.am

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

* bld/dist:
  minor, follow Alexandre Duret-Lutz' advice to predefine vars that get fiddled with in yuck.am
Revert "minor, follow Alexandre Duret-Lutz' advice to predefine vars that get fiddled with in yuck.am"

This reverts commit 6a3ce65cc3bf486928523645ea3efa2e34042f2f.
chore, make it mandatory for including Makefile.am files to preset the variables

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

* bld/dist:
  chore, make it mandatory for including Makefile.am files to preset the variables
  Revert "minor, follow Alexandre Duret-Lutz' advice to predefine vars that get fiddled with in yuck.am"
chore, allow to create distdir from scratch

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

* bld/dist:
  chore, allow to create distdir from scratch