[gprs] Makefile reorganization

We don't need to explicitly link telnet_interface.c and vty_interface_cmds.c
as they're now part of libvty.a

openbsc/src/Makefile.am

@@ -52,6 +52,5 @@ bsc_mgcp_LDADD = libvty.a
 ipaccess_proxy_SOURCES = ipaccess/ipaccess-proxy.c debug.c
 
 osmo_gb_proxy_SOURCES = gb_proxy.c gb_proxy_main.c gb_proxy_vty.c \
-			gprs_ns.c \
-			socket.c debug.c telnet_interface.c vty_interface_cmds.c 
+			gprs_ns.c socket.c debug.c
 osmo_gb_proxy_LDADD = libvty.a