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.

misc.c

@@ -1329,6 +1329,10 @@ blocking_read(int fd, char *buf, size_t nbytes)
 	ssize_t ret;
 	bool tried_reset = false;
 
+#ifdef __OS2__
+	int saved_mode = setmode(fd, O_TEXT);
+	int saved_errno;
+#endif
 	while ((ret = read(fd, buf, nbytes)) < 0) {
 		if (!tried_reset && errno == EAGAIN) {
 			if (reset_nonblock(fd) > 0) {
@@ -1339,6 +1343,11 @@ blocking_read(int fd, char *buf, size_t nbytes)
 		}
 		break;
 	}
+#ifdef __OS2__
+	saved_errno = errno;
+	setmode(fd, saved_mode);
+	errno = saved_errno;
+#endif
 	return (ret);
 }