[wsg] removing output file if it already exists
[wsg] removing output file if it already exists

This is because the example appends its output to the output file for each
file processed in the main loop.

perl6/perl6-examples,stmuk/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,Quinny/perl6-examples,Quinny/perl6-examples,shlomif/perl6-examples,Quinny/perl6-examples,perl6/perl6-examples,stmuk/perl6-examples,shlomif/perl6-examples,perl6/perl6-examples,shlomif/perl6-examples