Build dependency on gennews.sh for NEWS creation

Also consider only 3.x tags for news creation, and no merge commits.

Makefile.am

@@ -47,7 +47,7 @@ AUTHORS:
  )>$@ ; \
  else touch $@ ; fi
 
-NEWS:
+NEWS: gennews.sh
  $(AM_V_GEN)if test -x "`which git 2>/dev/null`" -a -d "$(srcdir)/.git" ; then \
  ( cd $(srcdir) ; \
  echo "$(PACKAGE) -- history of user-visible changes. $(DATE)" ; \

gennews.sh

@@ -9,7 +9,8 @@ fi
 t=
 i=0
 
-for o in $(git tag --sort=-creatordate) ""; do
+# consider only tags starting with a number, i.e. skip local junk tags
+for o in $(git tag --sort=-creatordate | grep ^3) ""; do
  if [ $i -ge 8 ]; then break; fi
  i=$((i+1))
  if [ -z "$t" ] ; then
@@ -43,7 +44,7 @@ for o in $(git tag --sort=-creatordate) ""; do
  /usr/bin/echo -e "$cmd\n\n$notes\n"
  fi
  fi
- cmd="git shortlog -e -n -w80,6,8 ${o}${o:+...}${t}"
+ cmd="git shortlog --no-merges -e -n -w80,6,8 ${o}${o:+...}${t}"
  /usr/bin/echo -e "$cmd\n\n$(eval $cmd)\n"
  t="$o"
 done|sed -r 's,[[:space:]][[:space:]]*$,,'