sbcl-1.0.27 released

SBCL 1.0.27 has been released.  Release notes:

changes in sbcl-1.0.27 relative to 1.0.26:
  * new port: support added for x86-64 OpenBSD. (thanks to Josh Elsasser)
  * new port: support added for x86-64 Solaris. (thanks to Alex Viskovatoff)
  * improvement: the system either recovers from stack exhaustion or dies
    properly as opposed to leaving the user uncertain of whether the handler
    trampled on some random memory next to the stack or having to rely on
    --lose-on-corruption (which is still a good idea to use in production
    because stack exhaustion can happen in signal handlers which will likely
    lead to hangs.)
  * bug fix: fix gc related interrupt handling bug on ppc (regression from
    1.0.25.37, reported by Harald Hanche-Olsen)
  * bug fix: work around signal delivery bug in darwin (regression from
    1.0.25.44, reported by Sidney Markowitz)
  * bug fix: fix ERROR leaking memory (reported by David Thompson)

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