Can't quickload sketch
Hi,

Trying to quickload sketch, but getting this error:

```
Linedit version 0.17.6, smart mode, ESC-h for help.
CL-USER(1): (ql:quickload :sketch)
To load "sketch":
  Load 1 ASDF system:
    sketch
; Loading "sketch"
...; 
; caught ERROR:
;   READ error during COMPILE-FILE:
;   
;     Symbol "SYSTEM-AREA-UB8-FILL" not found in the SB-KERNEL package.
;   
;       Line: 12, Column: 33, File-Position: 361
;   
;       Stream: #<SB-INT:FORM-TRACKING-STREAM for "file /home/kf/quicklisp/dists/quicklisp/software/static-vectors-v1.8.7/src/impl-sbcl.lisp" {100348F043}>

debugger invoked on a UIOP/LISP-BUILD:COMPILE-FILE-ERROR in thread
#<THREAD tid=390750 "main thread" RUNNING {1001480093}>:
  COMPILE-FILE-ERROR while compiling #<CL-SOURCE-FILE "static-vectors" "impl">
```
Running on Arch Linux, `SBCL 2.4.0`