Fix "illegal char" in build.xml

CI run on windows produce the following error:

D:\a\Arduino\Arduino\build\build.xml:365: java.nio.file.InvalidPathException: Illegal char <*> at index 42: D:\a\Arduino\Arduino\build\macosx\arduino-*.dmg

Author: cmaglie

build/build.xml

@@ -365,9 +365,11 @@
     <delete dir="macosx/work" />
     <delete dir="macosx/working_dir" />
     <delete dir="macosx/working.dmg" />
-    <delete file="macosx/arduino-*.dmg" />
     <delete>
-      <fileset dir="macosx" includes="arduino-*macosx*.zip"/>
+      <fileset dir="macosx" includes="arduino-*.dmg" />
+    </delete>
+    <delete>
+      <fileset dir="macosx" includes="arduino-*macosx*.zip" />
     </delete>
   </target>