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/tbr/tbr.c

@@ -4,7 +4,7 @@
 char              *c,q              [512              ],m[              256
 ],*v[           99], **u,        *i[3];int         f[2],p;main       (){for
  (m[m        [60]=   m[62      ]=32   ]=m[*      m=124   [m]=       9]=6;
-  e(-8)     ,gets      (1+(    c=q)     )||      exit      (0);     r(0,0)
+  e(-8)     ,gets      (1+(    c=q)     )||      (exit    (0),0);   r(0,0)
    )for(    ;*++        c;);  }r(t,      o){    *i=i        [2]=    0;for
      (u=v  +98           ;m[*--c]         ^9;m [*c]          &32  ?i[*c
        &2]=                *u,u-             v^98              &&++u:
@@ -19,5 +19,5 @@ char              *c,q              [512              ],m[              256
 	2	]?
 	6	D 1),e(creat(i[2],438)):
 	5	,e(execvp(*u,u))):e(chdir(u[1])*2):
-	3	;}e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||exit(1):
+	3	;}e(x){x<0?write(2,"?\n$ "-x/4,2),x+1||(exit(1),0):
 	5	;}