Avoid library from target prefix for INTREE_TCLSH
Avoid library from target prefix for INTREE_TCLSH

The libtcl library in the target location might be broken due to wrong
architecture, or missing other libraries. We should not rely on this
library to be robust. Override the library search path with
DYLD_LIBRARY_PATH.

See: https://trac.macports.org/ticket/46533

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