rogue[345]: fix backspace key in prompts. md_readchar() mapped KEY_BACKSPACE to CTRL-H, but get_str(), which handles prompts for strings, only backs up when it receives the erase character. The key should be mapped to md_erasechar(). This fixes Red Hat Bugzilla #847852.

/*
 * Super-Rogue
 * Copyright (C) 1984 Robert D. Kindelberger
 * All rights reserved.
 *
 * See the file LICENSE.TXT for full copyright and licensing information.
 */

#include	<sgtty.h>
typedef	struct sgttyb	SGTTY;
static SGTTY _tty, _res_flg;