CHAIN.TXT files need CRLF terminated lines

This was a regression (to just LF-terminated lines), an accidental change (from "text" to "binary" file-open) in commit 3bcab8a6.

src/sbbs3/xtrn_sec.cpp

@@ -297,7 +297,7 @@ void sbbs_t::xtrndat(const char *name, const char *dropdir, uchar type, ulong tl
 			strlwr(tmp);
 		SAFEPRINTF2(str,"%s%s",dropdir,tmp);
 		(void)removecase(str);
-		if((fp=fnopen(NULL, str, O_WRONLY|O_CREAT|O_TRUNC)) == NULL) {
+		if((fp=fnopen(NULL, str, O_WRONLY|O_CREAT|O_TRUNC|O_TEXT)) == NULL) {
 			errormsg(WHERE,ERR_OPEN,str,O_WRONLY|O_CREAT|O_TRUNC|O_TEXT);
 			return; 
 		}