4821 remove filebench

@@ -127,11 +127,10 @@
         cmd/fdetach \
         cmd/fdformat \
         cmd/fdisk \
         cmd/fgrep \
         cmd/file \
-        cmd/filebench \
         cmd/find \
         cmd/fmthard \
         cmd/fmtmsg \
         cmd/fold \
         cmd/fm \