Log Message:
Fix up sysutils/tkdesk, some.

 - Fix up the TCL interpreter result handling so we don't need to use
   USE_INTERP_RESULT.

 - Fix the first startup segfault (probably the one seen in PR 32807
   but not necessarily) by using Tcl_Free instead of trying to bypass
   it. Unfortunately, there's at least one more segfault at startup
   with no obvious cause.

 - Don't run off the end of string buffers.

 - Remove some uses of sprintf. Use standard headers. Other minor
   tidyups.

 - Correct glitch in the configury patches that made it link
   statically to blt.

 - Avoid passing empty variable names to test(1) during configure.

 - Fix some pkglint.

Bump PKGREVISION to 4, because even though it didn't run and still
doesn't, it does build. :-|