Log Message:
Updated st to version 1.5.1.

Changes from 1.5.0 to 1.5.1.
----------------------------
o  Andreas Gustafsson's USE_POLL fix.

o  Gene's st_set_utime_function() enhancement.

Changes from 1.4 to 1.5.0.
--------------------------
o  Andreas Gustafsson's performance patch.

o  New extensions:  Improved DNS resolver, generic LRU cache, in-process
   DNS cache, and a program to test the resolver and cache.

o  Support for AMD Opteron 64-bit CPUs under Linux.

o  Support for SPARC-64 under Solaris.

o  Andreas Gustafsson's support for VAX under NetBSD.

o  Changed unportable #warning directives in md.h to #error.