+changes in sbcl-1.0.26 relative to 1.0.25:
+ * incompatible change: GC-OFF and GC-ON are removed, they were
+ always unsafe. Use WITHOUT-GCING instead.
+ * new feature: runtime option --disable-ldb
+ * new feature: runtime option --lose-on-corruption to die at the
+ slightest hint of possibly non-recoverable errors: running out of
+ memory, stack, alien stack, binding stack, encountering a memory
+ fault, etc. In the absence of --lose-on-corruption a warning is
+ printed to stderr.
+ * optimization: slightly faster gc on multithreaded builds
+ * optimization: faster WITHOUT-GCING
+ * bug fix: real-time signals are not used anymore, so no more
+ hanging when the system wide real-time signal queue gets full.
+