Define backward load-sysdef to unbreak swank-asdf
Undelete function load-sysdef, which must continue to exist as long as people use the current version of SLIME (to be fixed imminently as of 2015-12-01), though it is OK for it to just issue an error. Indeed, swank-asdf supposes that any backward-compatibility function it defines will exist forever, by unconditionally calling fdefinition on them. Now, it depends on load-asd, the backward-compatible definition of which (for asdf older than 2.26.149) depends on load-sysdef, that it also defines for versions older than 2.16.
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