link-grammar.def: Remove 5 redundant symbols
link-grammar.def: Remove 5 redundant symbols

They are not in use anywhere.

ampli/link-grammar,opencog/link-grammar,opencog/link-grammar,MadBomber/link-grammar,MadBomber/link-grammar,ampli/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,opencog/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,linas/link-grammar,MadBomber/link-grammar,linas/link-grammar,linas/link-grammar,opencog/link-grammar,ampli/link-grammar,linas/link-grammar,ampli/link-grammar,MadBomber/link-grammar,ampli/link-grammar,linas/link-grammar,MadBomber/link-grammar,opencog/link-grammar,MadBomber/link-grammar,opencog/link-grammar,MadBomber/link-grammar,linas/link-grammar,MadBomber/link-grammar,ampli/link-grammar,linas/link-grammar,ampli/link-grammar