freetdm: added wait_dialtone_timeout parameter for ftmod_analog

if this parameter is set to 0 ftmod_analog will not wait
	 for dial tone before dialing out the requested number.
	 Anything bigger than 0 is the units in milliseconds to
	 wait for dialtone before aborting the call.

libs/freetdm/src/ftmod/ftmod_analog/ftdm_analog.h

@@ -46,6 +46,7 @@ typedef enum {
 struct ftdm_analog_data {
 	uint32_t flags;
 	uint32_t max_dialstr;
+	uint32_t wait_dialtone_timeout;
 	uint32_t digit_timeout;
 	char hotline[FTDM_MAX_HOTLINE_STR];
 };