Zoo - patches for Gould UTX/32 (PowerNode and NP1)

[Guy Harris]

>	  corrected implementation of the "gettz" routine;
>	  this may be of general use to BSD4.2 and BSD4.3-like systems

Note that the "tm_gmtoff" field should be used on all systems that
provide it.  This includes SunOS 4.0 and later releases, and appears to
include 4.3-tahoe as well.  It may also include Mach, at least on the
NeXT machine.