* telnetd/utility.c (nextitem, netclear, printoption, printsub)
(printdata): Remove register keyword usage.
* telnetd/utility.c (printsub): Don't add integer to string to try and
skip quote.
ftp: Friendlier printing of transfer speed.
ping, ping6: Repair pattern production.
More tests for more code coverage.
Support libshishi with Sun Studio.

Detect libshishi in a manner that allows Sun Studio
to fully recognize its presence, and build with it.