#7 Add tcl/tk debug libraries

[Larry W. Virden]

when tcl and/or tk are compiled with --enable-symbols,
the libraries are installed as libtcl{Major.Minor}g.so
and libtk{Major.Minor}g.so . BLT currently doesn't
recognize --enable-symbols and doesn't locate this
naming of the libraries, and so the Makefiles have to
be hand edited.

I'd like to request that, at the very least, the
libtcl*g.so and libtk*g.so libraries be recognized,
even if a debug version of libBLT isn't generated.