SB-THREAD:WAIT-ON-SEMAPHORE.
* enhancement: *STANDARD-OUTPUT*, *STANDARD-INPUT*, and *ERROR-OUTPUT* are
now bivalent.
+ * enhancement: errors from NO-APPLICABLE-METHOD and
+ NO-PRIMARY-METHOD now have a RETRY restart available to retry the
+ generic function call.
* bug fix: correct restart text for the continuable error in MAKE-PACKAGE.
* bug fix: a rare case of startup-time page table corruption.