bug#47064: [racket-users] bytevector-uncompress: internal error uncompressing

[Philip McGrath]

I can reproduce the error with just:
```
$ racket -l mred/private/wx/gtk/utils
$bytevector-uncompress: internal error uncompressing 
#"\0\0\0\0chez\310\224\206:\r()#\201\256R-d\205\233\24\363\5\20\201P\6A\v\300\0\16\f\6\31\2\f\6\f&H\275\0\1\0\362\bA\377e\0\1\0C\6A\21\3\v\300\0\201\265!\f\6\n\0\a\1\35\0\1+\0\360\27\201\375\300\0\0\0\17\205\210Z\0\0M\215\245\b\4\0\0M9fH\17\206fZ\0\0I\2...
  context...:
   body of 
"/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/gtk/utils.rkt"
```