All 1990 entries now compile!

My first 41st, 51st and 29th (all depending on the base) birthday
updates (possibly more will follow but this is not a certainty). All the
1990 entries now compile!

In one we used a patch from Yusuke Endoh (thank you Yusuke!) which we
credited him in the README and in another we used a tip from him (use
-ansi at the compiler line) to get the other to compile (again, thank
you Yusuke!). We fixed the others. In the case of 1990/tbr/tbr.c the
author had supplied a shorter version and we fixed that one too.

Added 1990/.gitignore which has the built files of 1990 so that after
doing `cd 1990 ; make all' running `git status .' will not show any
untracked files.

1990/westley/README.md

@@ -36,8 +36,8 @@
     make it easier on news readers, we converted each control-L to 
     a blank line.
 
-    Some ANSI compilers will not accept '1s' as a short integer - for
-    these compilers replace the '1s' with '1'.
+    Some modern compilers will not accept '1s' as a short integer - for
+    these compilers we replaced the instances of `1s` with `1`.
 
 
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