chore, check for libltdl

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, import unsermon.h with dso specs

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, implement ud_mondec_reg() and ud_mondec_dereg() via simple lookup table

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, migrate to mondec funs from the decmap, for ctrl messages print brief default

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, compile svc-pong as unsermon dso with the ping service decoder

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, add a notion of libexecdir to unserding.pc

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, PEBKAC, build svc-pong.la with XCCLDFLAGS

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, discard uterus remnants (again) from unsermon.c

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, include string.h for strlen() in unsermon.c

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, change DSO initialiser entry point name to ud_mondec_init()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, build svc-uterus.so DSO for demonstration purposes

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
hygiene, use LTX name for svc_pong's ud_mondec_init() and define an alias for it

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, link svc-pong and svc-uterus DSOs with unsermon (non-standard)

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

* tool/unsermon:
  chore, link svc-pong and svc-uterus DSOs with unsermon (non-standard)
  hygiene, use LTX name for svc_pong's ud_mondec_init() and define an alias for it
  minor, build svc-uterus.so DSO for demonstration purposes
  hygiene, change DSO initialiser entry point name to ud_mondec_init()
  hygiene, include string.h for strlen() in unsermon.c
  chore, discard uterus remnants (again) from unsermon.c
  fix, PEBKAC, build svc-pong.la with XCCLDFLAGS
  chore, add a notion of libexecdir to unserding.pc
  minor, compile svc-pong as unsermon dso with the ping service decoder
  minor, migrate to mondec funs from the decmap, for ctrl messages print brief default
  minor, implement ud_mondec_reg() and ud_mondec_dereg() via simple lookup table
  minor, import unsermon.h with dso specs
  chore, check for libltdl