Log Message:
update to 1.6.6

changes:
-minor feature additions to the command line tools
-C++ API: Added support for Szip
-bugfixes

pkgsrc changes:
-fixes for the cxx option (should be a separate pkg)
-fixes for the threadsafe option -- replaced a pthread_equal() by a
 simple "==" to make it usable with non-threaded apps
 (not 100% portable, but should be fine for the platforms in question)
 The shared libraries should not be linked against libpthread, but
 that would require serious changes to the autoconf/make machinery
 so I've left it alone for now.
 If that is fixed, "threadsafe" could be made default.
-Don't try to strip scripts on install.