First steps towards supporting W32.

This is mainly source code reorganization.
Update gnulib.
g10/ does currently not build.

agent/gpg-agent.c

@@ -260,22 +260,6 @@ my_strusage (int level)
 
 
 
-static void
-i18n_init (void)
-{
-#ifdef USE_SIMPLE_GETTEXT
-    set_gettext_file( PACKAGE_GT );
-#else
-#ifdef ENABLE_NLS
-    setlocale (LC_ALL, "");
-    bindtextdomain (PACKAGE_GT, LOCALEDIR);
-    textdomain (PACKAGE_GT);
-#endif
-#endif
-}
-
-
-
 /* Setup the debugging.  With the global variable DEBUG_LEVEL set to NULL
    only the active debug flags are propagated to the subsystems.  With
    DEBUG_LEVEL set, a specific set of debug flags is set; thus overriding