Disable a bunch of undesirable termios flags. ICRNL, in particular,

is liable to have been set on serial ports previously used as
terminal devices, and definitely wants not to be set on serial ports
being used for callout.

[originally from svn r6865]

unix/uxser.c

@@ -205,7 +205,16 @@ static const char *serial_configure(Serial serial, Config *cfg)
 
     options.c_cflag |= CLOCAL | CREAD;
     options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
-    options.c_oflag &= ~OPOST;
+    options.c_iflag &= ~(ISTRIP | IGNCR | INLCR | ICRNL
+#ifdef IUCLC
+			 | IUCLC
+#endif
+			 );
+    options.c_oflag &= ~(OPOST
+#ifdef ONLCR
+			 | ONLCR
+#endif
+			 | OCRNL | ONOCR | ONLRET);
     options.c_cc[VMIN] = 1;
     options.c_cc[VTIME] = 0;