chore, define PKG_CHECK_VAR_MSG() without using the latest and greatest autoconf macroes

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

* bld/dist:
  chore, define PKG_CHECK_VAR_MSG() without using the latest and greatest autoconf macroes
fix, PEBKAC, in sock_listener()'s bind use the sockaddr ptr provided

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
chore, talk about address families in make_tcp() and make_dccp()

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
fix, reset temporary socket var s to -1 after close()ing the socket

Signed-off-by: Sebastian Freundt <freundt@ga-group.nl>
minor, reset the sockaddr structure to init values after going through dccp initialisation

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

* fix/advertiser-uri:
  minor, reset the sockaddr structure to init values after going through dccp initialisation
  fix, reset temporary socket var s to -1 after close()ing the socket
  chore, talk about address families in make_tcp() and make_dccp()
  fix, PEBKAC, in sock_listener()'s bind use the sockaddr ptr provided
Merge branch 'next'

* next:
  minor, reset the sockaddr structure to init values after going through dccp initialisation
  fix, reset temporary socket var s to -1 after close()ing the socket
  chore, talk about address families in make_tcp() and make_dccp()
  fix, PEBKAC, in sock_listener()'s bind use the sockaddr ptr provided
  chore, define PKG_CHECK_VAR_MSG() without using the latest and greatest autoconf macroes
  chore, kick mxml check from c.ac
  minor, extend PKG_CHECK_VAR_MSG functionality to match pkg-config's PKG_CHECK_VAR
  chore, rename PKG_CHECK_VAR -> PKG_CHECK_VAR_MSG (to avoid naming conflict)