build: don't link static libraries multiple times

libnm-core.a should only be linked once in libnm.so. Previously,
it was linked twice, once as part of libnm-utils.a and once
directly in libnm.so.

Fixes: 8df944c7e4

Makefile.am

@@ -863,8 +863,6 @@ EXTRA_libnm_libnm_la_DEPENDENCIES = \
 	libnm/libnm.ver
 
 libnm_libnm_la_LIBADD = \
-	libnm-core/libnm-core.la \
-	introspection/libnmdbus.la \
 	libnm/libnm-utils.la \
 	$(DL_LIBS) \
 	$(GLIB_LIBS) \