[4/6] libdingaling: Rename AUTOMAKE_OPTS to AUTOMAKE_OPTIONS

The latter is a well known automake variable, used
to set (per-Makefile) automake options and supported
since the beginning of time (= automake 1.4).

The former is a made-up variable that doesn't really
do anything.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>

libs/libdingaling/Makefile.am

 EXTRA_DIST =
 SUBDIRS = 
-AUTOMAKE_OPTS=foreign
+AUTOMAKE_OPTIONS = foreign
 NAME=dingaling
 PREFIX=$(prefix)
 TOUCH_TARGET=@if test -f "$@" ; then touch "$@" ; fi ;