kconfig: remove CONFIG_ from string constants

Having the CONFIG_ prefix in string constants gets in the way of
using a run-time-defined CONFIG_ prefix.

Fix that by using temp growable strings (gstr) in which we printf
the text.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Michal Marek <mmarek@suse.cz>
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index 48f6744..5f29618 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -348,15 +348,19 @@
 {
 	struct symbol **sym_arr;
 	struct gstr res;
+	struct gstr title;
 	char *dialog_input;
 	int dres, vscroll = 0, hscroll = 0;
 	bool again;
 
+	title = str_new();
+	str_printf( &title, _("Enter %s (sub)string to search for "
+			      "(with or without \"%s\")"), CONFIG_, CONFIG_);
+
 again:
 	dialog_clear();
 	dres = dialog_inputbox(_("Search Configuration Parameter"),
-			      _("Enter " CONFIG_ " (sub)string to search for "
-				"(with or without \"" CONFIG_ "\")"),
+			      str_get(&title),
 			      10, 75, "");
 	switch (dres) {
 	case 0:
@@ -365,6 +369,7 @@
 		show_helptext(_("Search Configuration"), search_help);
 		goto again;
 	default:
+		str_free(&title);
 		return;
 	}
 
@@ -398,6 +403,7 @@
 		str_free(&res);
 	} while (again);
 	free(sym_arr);
+	str_free(&title);
 }
 
 static void build_conf(struct menu *menu)