rhel: update generate directive

This makes the shell command also use `go run` and puts the `file2fuzz`
command in the `tools.go` file. The dependency was already indirectly
tracked by including the `stringer` command.

Signed-off-by: Hank Donnay <hdonnay@redhat.com>

rhel/dockerfile/fuzz_test.go

@@ -22,4 +22,4 @@ func FuzzLex(f *testing.F) {
 	})
 }
 
-//go:generate sh -c "file2fuzz -o testdata/fuzz/FuzzLex $(ls -1 testdata/Dockerfile* | grep -v [.]want)"
+//go:generate sh -c "go run golang.org/x/tools/cmd/file2fuzz -o testdata/fuzz/FuzzLex $(ls -1 testdata/Dockerfile* | grep -v [.]want)"

tools.go

@@ -4,5 +4,6 @@ package claircore
 
 import (
 	_ "github.com/golang/mock/mockgen"
+	_ "golang.org/x/tools/cmd/file2fuzz"
 	_ "golang.org/x/tools/cmd/stringer"
 )