updated for version 7.3.191
Problem:    Still some RISC OS stuff to remove.
Solution:   Remove files and lines. (Hong Xu)
            Remove the 'osfiletype' option code.
diff --git a/src/pty.c b/src/pty.c
index bc28c0d..59e0069 100644
--- a/src/pty.c
+++ b/src/pty.c
@@ -123,8 +123,7 @@
 static void initmaster __ARGS((int));
 
 /*
- *  Open all ptys with O_NOCTTY, just to be on the safe side
- *  (RISCos mips breaks otherwise)
+ *  Open all ptys with O_NOCTTY, just to be on the safe side.
  */
 #ifndef O_NOCTTY
 # define O_NOCTTY 0