1.0.45.35: revert 1.0.45.30 due to regression (lp#677779)

1.0.45.35: revert 1.0.45.30 due to regression (lp#677779)

 Reported by Ariel Badichi on sbcl-devel.

 Using WITH-COMPILATION-UNIT to silence UNDEFINED-FUNCTION style-warnings for
 forward-referenced functions was a bad idea after all: it caused cores dumped
 using it to be started with **WORLD-LOCK** held by a dead thread.

 ...and it's not like WITH-COMPILATION-UNIT would ever get to summarize the
 unit anyways the way it was used there.

 Proper fix for this is to use UNDEFINED-REFERENCE-STYLE-WARNING as separate
 condition class and just muffle those -- but this is too much to put in
 during the freeze and will wait till after 1.0.46.