lib: make resolve_hosts variable common

Any iproute utility that uses any function from lib/utils.c needs
to declare its own resolve_hosts variable instance although it does
not need/use hostname resolving functionality (currently only 'ip'
and 'ss' commands uses this).
The patch declares single common instance of resolve_hosts directly
in utils.c so the existing ones can be removed (the same approach
that is used for timestamp_short).

Cc: Jiri Pirko <jiri@mellanox.com>
Cc: Arkadi Sharshevsky <arkadis@mellanox.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>

bridge/bridge.c

@@ -18,7 +18,6 @@
 
 struct rtnl_handle rth = { .fd = -1 };
 int preferred_family = AF_UNSPEC;
-int resolve_hosts;
 int oneline;
 int show_stats;
 int show_details;

genl/genl.c

@@ -30,7 +30,6 @@
 int show_stats = 0;
 int show_details = 0;
 int show_raw = 0;
-int resolve_hosts = 0;
 
 static void *BODY;
 static struct genl_util * genl_list;

ip/ip.c

@@ -30,7 +30,6 @@ int human_readable;
 int use_iec;
 int show_stats;
 int show_details;
-int resolve_hosts;
 int oneline;
 int brief;
 int json;

ip/rtmon.c

@@ -25,7 +25,6 @@
 #include "utils.h"
 #include "libnetlink.h"
 
-int resolve_hosts;
 static int init_phase = 1;
 
 static void write_stamp(FILE *fp)

lib/utils.c

@@ -37,6 +37,7 @@
 #include "utils.h"
 #include "namespace.h"
 
+int resolve_hosts;
 int timestamp_short;
 
 int get_hex(char c)

misc/arpd.c

@@ -38,8 +38,6 @@
 #include "utils.h"
 #include "rt_names.h"
 
-int resolve_hosts;
-
 DB	*dbase;
 char	*dbname = "/var/lib/arpd/arpd.db";
 

misc/ss.c

@@ -88,7 +88,6 @@ static int security_get_initial_context(char *name,  char **context)
 }
 #endif
 
-int resolve_hosts;
 int resolve_services = 1;
 int preferred_family = AF_UNSPEC;
 int show_options;

tc/tc.c

@@ -39,7 +39,6 @@ int show_graph;
 int timestamp;
 
 int batch_mode;
-int resolve_hosts;
 int use_iec;
 int force;
 bool use_names;