as per Daniel Barlow's suggestion and Martin Atzmueller's patch
changes in sbcl-0.6.12 relative to sbcl-0.6.11:
+?? many patches ported from CMU CL by Martin Atzmueller, notably
+ ??
+ ??
?? new fasl file format version number (because a disused byte code
opcode was removed, causing the other opcodes to change)
* various tweaks to make the system easier to build under other