chore, PEBKAC, properly embrace conditional substs in texi2h2m.sh sed script

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, avoid double listing of BUILT_SOURCES in EXTRA_DIST

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, use suffix th2m for texi sources that will be conv'd by texi2h2m.sh

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, generate .x and .xh out of .ggo

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, adapt info and man generators in info/ to -clo.ggo -> .ggo change

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, don't use GNU make patterns, use suffix rules instead

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, PEBKAC, follow autoconf advice and don't use variables in VPATH

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, don't use GNU make patterns in src/, use suffixes instead

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, don't use GNU make patterns in lib/, use suffixes instead

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, don't use GNU make patterns in test/, use suffixes instead

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

* bld/netbsd:
  chore, adapt info and man generators in info/ to -clo.ggo -> .ggo change
  chore, generate .x and .xh out of .ggo
  minor, use suffix th2m for texi sources that will be conv'd by texi2h2m.sh
  hygiene, avoid double listing of BUILT_SOURCES in EXTRA_DIST
  chore, PEBKAC, properly embrace conditional substs in texi2h2m.sh sed script
Merge branch 'bld/fight-GNUisms' into next

* bld/fight-GNUisms:
  minor, don't use GNU make patterns in test/, use suffixes instead
  minor, don't use GNU make patterns in lib/, use suffixes instead
  minor, don't use GNU make patterns in src/, use suffixes instead
  fix, PEBKAC, follow autoconf advice and don't use variables in VPATH
  minor, don't use GNU make patterns, use suffix rules instead