Revert "Clamav prescan (#389)"

This reverts commit cff0a88bf3.

cmd/cmd.go

@@ -240,11 +240,6 @@ var globalFlags = []cli.Flag{
 		Value:  "",
 		EnvVar: "CLAMAV_HOST",
 	},
-	cli.BoolFlag{
-		Name:   "perform-clamav-prescan",
-		Usage:  "perform-clamav-prescan",
-		EnvVar: "PERFORM_CLAMAV_PRESCAN",
-	},
 	cli.StringFlag{
 		Name:   "virustotal-key",
 		Usage:  "virustotal-key",
@@ -393,14 +388,6 @@ func New() *Cmd {
 			options = append(options, server.ClamavHost(v))
 		}
 
-		if v := c.Bool("perform-clamav-prescan"); !v {
-			if c.String("clamav-host") == "" {
-				panic("clamav-host not set")
-			}
-
-			options = append(options, server.PerformClamavPrescan(v))
-		}
-
 		if v := c.Int64("max-upload-size"); v > 0 {
 			options = append(options, server.MaxUploadSize(v))
 		}