Name: find_call_out - find out if a call_out is still pending

Syntax:
	int find_call_out(string func)

Description:
	The find_call_out efun finds the first call out due to be executed
	for function 'func'

Return value:
	If such a call out is found, the call-out time left is returned.
	If it is not found, then -1 is returned.

Examples:
	int time_left;
	time_left=find_call_out("call_me");

See also: efun/call_out, efun/remove_call_out, efun/call_out_info, w/call_outs