Log Message:
Update to 1.8.3.  Several patches were merged upstream.

Changes in 1.8.3 (since 1.8.2)

* New modules (see the manual for details)

** `(srfi srfi-35)'
** `(srfi srfi-37)'

* Bugs fixed

** The `(ice-9 slib)' module now works as expected
** Expressions like "(set! 'x #t)" no longer yield a crash
** Warnings about duplicate bindings now go to stderr
** A memory leak in `make-socket-address' was fixed
** Alignment issues (e.g., on SPARC) in network routines were fixed
** A threading issue that showed up at least on NetBSD was fixed
** Build problems on Solaris and IRIX fixed

* Implementation improvements

** The reader is now faster, which reduces startup time
** Procedures returned by `record-accessor' and `record-modifier' are faster