#9 sybtcl configure updates needed

[Larry W. Virden]

1. unix/configure, at least, generates code that says it is for Tcl 8.4. 8.5 should be supported.

2. configure doesn't appear to recognize flags to specify where to find tcl.h and libtcl.a .

3. configure doesn't appear to recognize TCL_LIB_DIR and TCL_INC_DIR variables when present in the environment.

User is left having to edit the generated Makefile and other files so that Makefile works.