tcllib: Use INTREE_TCLSH for build and install
tcllib: Use INTREE_TCLSH for build and install

The tcllib build scripts need a working tclsh for installation. The
configure script resolves tclsh to be at the target install location in
the prefix. We should not depend on that tclsh working, therefore
forcing it to use the tclsh we just built.

neverpanic/macports-base,danchr/macports-base,danchr/macports-base,neverpanic/macports-base,macports/macports-base,macports/macports-base