core: add option "libs" for command /debug, add signal "debug_libs"

src/gui/curses/gui-curses-main.c

@@ -297,6 +297,17 @@ gui_main_signal_sigwinch ()
     gui_window_ask_refresh (2);
 }
 
+/*
+ * Displays infos about ncurses lib.
+ */
+
+void
+gui_main_debug_libs ()
+{
+    gui_chat_printf (NULL, "    ncurses: v%s (patch %d)",
+                     NCURSES_VERSION, NCURSES_VERSION_PATCH);
+}
+
 /*
  * Refreshs for windows, buffers, bars.
  */

src/gui/gui-main.h

@@ -25,6 +25,7 @@
 extern void gui_main_get_password (const char *prompt1, const char *prompt2,
                                    const char *prompt3,
                                    char *password, int size);
+extern void gui_main_debug_libs ();
 extern void gui_main_loop ();
 extern void gui_main_pre_init (int *argc, char **argv[]);
 extern void gui_main_init ();