build: libosmo-gtlv: move LIBS to libosmo_gtlv_la_LIBADD

Change-Id: I6fd777bed9366c35f5b1453cde1e6f5c1617e338

src/libosmo-gtlv/Makefile.am

@@ -9,10 +9,6 @@ AM_CFLAGS = \
 	$(LIBOSMOCORE_CFLAGS) \
 	$(NULL)
 
-AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(NULL)
-
 lib_LTLIBRARIES = \
 	libosmo-gtlv.la \
 	$(NULL)
@@ -23,6 +19,10 @@ libosmo_gtlv_la_SOURCES = \
 	gtlv_gen.c \
 	$(NULL)
 
+libosmo_gtlv_la_LIBADD = \
+	$(LIBOSMOCORE_LIBS) \
+	$(NULL)
+
 # This is _NOT_ the library release version, it's an API version.
 # Please read Chapter 6 "Library interface versions" of the libtool
 # documentation before making any modification