patch 8.0.1749: VMS: 100% CPU use, redefining mch_open() fails

Problem:    VMS: 100% CPU use, redefining mch_open() and mch_fopen() fails.
Solution:   Do not wait indefinitely in RealWaitForChar(). (Neil Rieck)
            Do not redefine mch_open() and mch_fopen() on VMS. (Zoltan
            Arpadffy)
diff --git a/src/os_vms.c b/src/os_vms.c
index 84f84ac..61db3a8 100644
--- a/src/os_vms.c
+++ b/src/os_vms.c
@@ -784,7 +784,7 @@
 	    return 0;
 	} else if (msec < 0) {
 	    /* no time-out; wait on indefinitely */
-	    continue;
+	    return 1; /* fakeout to force a wait in vms_read() */
 	} else {
 	    /* time-out needs to be checked */
 	    status = sys$gettim(&time_curr);