xbps-bin: add support to check integrity of all installed packages,

through "xbps-bin check all".

--HG--
extra : convert_revision : xtraeme%40gmail.com-20091005224237-plr75i3wveirhu4p

bin/xbps-bin/defs.h

@@ -31,6 +31,7 @@ void	xbps_autoremove_pkgs(void);
 void	xbps_remove_installed_pkg(const char *, bool);
 void	xbps_autoupdate_pkgs(bool);
 int	xbps_check_pkg_integrity(const char *);
+int	xbps_check_pkg_integrity_all(void);
 int	xbps_show_pkg_deps(const char *);
 int	xbps_show_pkg_reverse_deps(const char *);