Read in text mode, write in binary mode on OS/2

This enables to convert CR+LF to LF when reading, but disables to
convert LF to CR+LF when writing.

Instead, however, CR+LF are not passed into mksh as is.

main.c

@@ -1438,6 +1438,10 @@ openpipe(int *pv)
 	pv[1] = savefd(lpv[1]);
 	if (pv[1] != lpv[1])
 		close(lpv[1]);
+#ifdef __OS2__
+	setmode(pv[0], O_TEXT);
+	setmode(pv[1], O_BINARY);
+#endif
 }
 
 void