Split the compiled pieces out of tcllib into a slave port of its own to avoid
a circular dependency: compiling C-files of tcllib requires critcl, but critcl
requires the cmdline (pure-Tcl) component of tcllib.
PR: 195863, 200612
Approved by: gahr (blanket)
Upgrade from 0.8 to 1.2. Use the included tests once at build time
instead of installing them. Use the included installation routine (which does
not install documentation other than the man-pages).