1.0.42.31: fix build with clisp 2.49

 Patch by Josh Elsasser, lp#629144.

 Previously, if a clisp 2.49 host was used, the build failed during
 make-host-1 in src/code/cross-sap.lisp with several "redefining SETF
 expander" errors. The same *suppress-check-redefinition* fix used in
 make-host-2 is enough to placate clisp and allow the build to finish
 successfully.