dosbox: add uninstaller script (#2687)

bucket/consul.json

@@ -1,6 +1,6 @@
 {
     "homepage": "https://www.consul.io",
-    "description": "Service Discovery and Configuration ",
+    "description": "Service Discovery and Configuration",
     "license": "MPL-2.0",
     "version": "1.3.0",
     "architecture": {

bucket/dosbox.json

@@ -10,6 +10,12 @@
             "/D=$dir"
         ]
     },
+    "uninstaller": {
+        "file": "uninstall.exe",
+        "args": [
+            "/S"
+        ]
+    },
     "bin": [
         "DOSBox.exe",
         "SDL.dll",