Add original code of 1986/wall back

By original it is in alt but which works with -traditional-cpp. This is
to match other entries which also have this done.

Manifest updated.

1986/wall/README.md

@@ -4,6 +4,9 @@
     make all
 ```
 
+There is an alternate version for those with a compiler that support
+`-traditional-cpp`. See [Alternate code](#alternate-code) below.
+
 
 ## To use:
 
@@ -12,6 +15,23 @@
 ```
 
 
+## Alternate code:
+
+This version is the original but which can be used if you have a compiler that
+supports the `-traditional-cpp` option.
+
+
+### Alternate build:
+
+``` <!--sh-->
+	make alt
+```
+
+### Alternate use:
+
+Use `wall.alt` as you would `wall` above.
+
+
 ## Judges' remarks:
 
 The original version did not have a ';' character in the first line.