libtool warns about a useless -version-info flag for convenience libraries,
see:
http://git.savannah.gnu.org/cgit/libtool.git/tree/build-aux/ltmain.in#n6882
Let's just remove it, it doesn't serve a purpose.
librrdupd_la_SOURCES = $(UPD_C_FILES)
librrdupd_la_LIBADD = $(CORE_LIBS)
librrdupd_la_CFLAGS = $(AM_CFLAGS) $(MULTITHREAD_CFLAGS)
-librrdupd_la_LDFLAGS = $(MULTITHREAD_LDFLAGS) -version-info @LIBVERS@
+librrdupd_la_LDFLAGS = $(MULTITHREAD_LDFLAGS)
librrd_la_SOURCES = $(RRD_C_FILES)
librrd_la_DEPENDENCIES = librrdupd.la
librrdupd_la_SOURCES = $(UPD_C_FILES)
librrdupd_la_LIBADD = $(CORE_LIBS)
librrdupd_la_CFLAGS = $(AM_CFLAGS) $(MULTITHREAD_CFLAGS)
-librrdupd_la_LDFLAGS = $(MULTITHREAD_LDFLAGS) -version-info @LIBVERS@
+librrdupd_la_LDFLAGS = $(MULTITHREAD_LDFLAGS)
librrd_la_SOURCES = $(RRD_C_FILES)
librrd_la_DEPENDENCIES = librrdupd.la
librrd_la_LIBADD = librrdupd.la $(ALL_LIBS) $(LIBINTL)