Remove Discord RPC checks for unsuitable devices (#5594)

* Allow Discord RPC disabiling on ARM devices

* Remove Discord RPC check

desktop/src/com/unciv/app/desktop/DesktopLauncher.kt

@@ -51,8 +51,7 @@ internal object DesktopLauncher {
 
         val game = UncivGame(desktopParameters)
 
-        if (!RaspberryPiDetector.isRaspberryPi()) // No discord RPC for Raspberry Pi, see https://github.com/yairm210/Unciv/issues/1624
-            tryActivateDiscord(game)
+        tryActivateDiscord(game)
 
         LwjglApplication(game, config)
     }

desktop/src/com/unciv/app/desktop/RaspberryPiDetector.kt

@@ -1,61 +0,0 @@
-package com.unciv.app.desktop
-
-import java.io.BufferedReader
-import java.io.File
-import java.io.FileInputStream
-import java.io.InputStreamReader
-
-/**
- * Raspberry PI  helper class
- * https://stackoverflow.com/questions/37053271/the-ideal-way-to-detect-a-raspberry-pi-from-java-jar
- * @author wf
- */
-object RaspberryPiDetector {
-    var debug = false
-    /**
-     * check if this java vm runs on a raspberry PI
-     *
-     * @return true if this is running on a Raspbian Linux
-     */
-    fun isRaspberryPi(): Boolean {
-        val osRelease = osRelease()
-        return osRelease != null && osRelease.contains("Raspbian")
-    }
-
-    /**
-     * read the first line from the given file
-     *
-     * @param file
-     * @return the first line
-     */
-    private fun readFirstLine(file: File): String? {
-        var firstLine: String? = null
-        try {
-            if (file.canRead()) {
-                val fis = FileInputStream(file)
-                val bufferedReader = BufferedReader(
-                        InputStreamReader(fis))
-                firstLine = bufferedReader.readLine()
-                fis.close()
-            }
-        } catch (th: Throwable) {
-            if (debug) th.printStackTrace()
-        }
-        return firstLine
-    }
-
-    /**
-     * get the operating System release
-     *
-     * @return the first line from /etc/os-release or null
-     */
-    private fun osRelease(): String? {
-        val os = System.getProperty("os.name")
-        if (os.startsWith("Linux")) {
-            val osRelease = File("/etc", "os-release")
-            return readFirstLine(osRelease)
-        }
-        return null
-    }
-
-}