if the mutex is uncontested on Linux.
* bug fix: symbol-macro expansion now uses the *MACROEXPAND-HOOK*
as specified by the CLHS. (thanks to Tobias Rittweiler)
+ * bug fix: NaN comparison now works on x86-64.
changes in sbcl-1.0.10 relative to sbcl-1.0.9:
* minor incompatible change: the MSI installer on Windows no longer