macdeploy: remove existing Bitcoin-Core.dmg if present

Author: fanquake

contrib/macdeploy/macdeployqtplus

@@ -523,6 +523,7 @@ verbose = config.verbose
 # ------------------------------------------------
 
 app_bundle = config.app_bundle[0]
+appname = config.appname[0]
 
 if not os.path.exists(app_bundle):
     sys.stderr.write("Error: Could not find app bundle \"{}\"\n".format(app_bundle))
@@ -531,13 +532,12 @@ if not os.path.exists(app_bundle):
 # ------------------------------------------------
 
 if os.path.exists("dist"):
-    print("+ Removing old dist folder +")
-    
+    print("+ Removing existing dist folder +")
     shutil.rmtree("dist")
 
-# ------------------------------------------------
-
-appname = config.appname[0]
+if os.path.exists(appname + ".dmg"):
+    print("+ Removing existing DMG +")
+    os.unlink(appname + ".dmg")
 
 # ------------------------------------------------