undef ISASCII before we define our own (problem on Irix)

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@15124 ec53bebd-3082-4978-b11e-865c3cabbd6b

appl/telnet/telnet/telnet.c

@@ -579,6 +579,7 @@ mklist(char *buf, char *name)
 		 * Skip entries with spaces or non-ascii values.
 		 * Convert lower case letters to upper case.
 		 */
+#undef ISASCII
 #define ISASCII(c) (!((c)&0x80))
 		if ((c == ' ') || !ISASCII(c))
 			n = 1;