many SBCL versions broken

[avodonosov]

The commit 810fc0e breaks fiveam on many SBCL versions, including 1.3.21

; caught ERROR:
;   READ error during COMPILE-FILE:
;   
;     Symbol "&OPTIONAL-AND-&KEY-IN-LAMBDA-LIST" not found in the SB-KERNEL package.
;   
;       Line: 282, Column: 78, File-Position: 12597

https://cl-test-grid.common-lisp.dev/library/fiveam.html

Note, that for many platforms, the "official" SBCL version is even older than 1.3.21: http://www.sbcl.org/platform-table.html

[sionescu]

Thanks, fixed.