Remove an unused script

[ci skip]

platform/android/sign.sh

@@ -1,9 +0,0 @@
-#!/bin/bash
-
-jarsigner -digestalg SHA1 -sigalg MD5withRSA -verbose -keystore my-release-key.keystore "$1" reduz
-
-echo ""
-echo ""
-echo "Checking if APK is verified..."
-jarsigner -verify "$1" -verbose -certs
-