if sed is available, remove <filename unknown> from quickfix list for test runs
if sed is available, remove <filename unknown> from quickfix list for test runs

anurse/omnisharp-vim,AndBicScadMedia/omnisharp-vim,den-mentiei/omnisharp-vim,OmniSharp/omnisharp-vim,nosami/omnisharp-vim,OmniSharp/omnisharp-vim,OmniSharp/omnisharp-vim