Fixed image build warning.
Fixed image build warning.

binghe/cormanlisp,sharplispers/cormanlisp,binghe/cormanlisp,sharplispers/cormanlisp,binghe/cormanlisp,binghe/cormanlisp,binghe/cormanlisp,sharplispers/cormanlisp,sharplispers/cormanlisp,binghe/cormanlisp,binghe/cormanlisp,sharplispers/cormanlisp,sharplispers/cormanlisp,binghe/cormanlisp,sharplispers/cormanlisp,sharplispers/cormanlisp