Eric the half-a-wit, driven to berserk rage after repeatedly doing

Eric the half-a-wit, driven to berserk rage after repeatedly doing
builds during which he forgot to uncomment crucial library lines in
Setup, walks into Guido's East End nightclub with a tactical nuclear
weapon on his shoulder.  Said nuclear weapon is promptly deployed
exactly where it will do the most good, right in the middle of
configure.in.

With this patch, the set of libraries autoconfigured in is extended to
include ndbm, gdbm, and crypt.  This essentially eliminates any need to
tweak Setup for a normal Linux build.

"'E was a fair man.  Cruel, but fair."