resolv: Call _res_hconf_init from __res_vinit

Many callers of __res_maybe_init also call _res_hconf_init.
Additional calls to the latter do not hurt because the function
does its work only once.  (/etc/hosts.conf is not reloaded or
even checked for changes.)  This means that we can simplify the
code by calling _res_hconf_init directly from __res_vinit.

nscd/aicache.c

@@ -26,7 +26,6 @@
 #include <unistd.h>
 #include <sys/mman.h>
 #include <resolv/resolv-internal.h>
-#include <resolv/res_hconf.h>
 
 #include "dbg_log.h"
 #include "nscd.h"
@@ -102,7 +101,6 @@ addhstaiX (struct database_dyn *db, int fd, request_header *req,
   nip = hosts_database;
 
   /* Initialize configurations.  */
-  _res_hconf_init ();
   if (__res_maybe_init (&_res, 0) == -1)
     no_more = 1;
 

nscd/gethstbyad_r.c

@@ -28,7 +28,6 @@
 #define EXTRA_VARIABLES , ttlp
 #define NEED_H_ERRNO	1
 #define NEED__RES	1
-#define NEED__RES_HCONF 1
 
 /* We are nscd, so we don't want to be talking to ourselves.  */
 #undef	USE_NSCD

nscd/gethstbynm3_r.c

@@ -32,7 +32,7 @@
 #define ADD_VARIABLES	name, af
 #define EXTRA_VARIABLES	, ttlp, canonp
 #define NEED_H_ERRNO	1
-#define NEED__RES_HCONF 1
+#define NEED__RES       1
 
 #define HANDLE_DIGITS_DOTS	1
 #define HAVE_LOOKUP_BUFFER	1