readline: CPPFunction was removed in version 6.3-5 of readline

CPPFunction was deprecated in readling-4.2. Stop using the old
symbol and update the autoconf test.

2014-05-26  Holger Hans Peter Freyther  <holger@moiji-mobile.com>

	* input.c: Use rl_quote_func_t, rl_dequote_func_t and
	rl_completion_func_t instead of the deprecated CPPFunction
blox: Direct usage of result is deprecated and stops working

Use Tcl_GetStringResult(interp) instead of interp->result on
newer versions of Tcl. It looks like Tcl_GetStringResult has
been present in the entire 8.0 series.

2014-05-26  Holger Hans Peter Freyther  <holger@moiji-mobile.com>

	* BloxTK.c: Use Tcl_GetStringResult to access the result.