Ok, it turns out I was premature. cl-autowrap uses spec files produced
against an SDL 2.0.0 distribution. So, if one installs an SDL 2.0.1
distribution, then there is a version skew between the in image lisp
code generated by cl-autowrap from the SDL 2.0.0 spec files and the
actually loaded library of SDL 2.0.1. This is no good. So revert the
change I made and explain why we ask for a specific version.