add abi helper function

src/main/scala/com/github/shadowsocks/Shadowsocks.scala

@@ -800,7 +800,7 @@ class Shadowsocks
 
   def reset() {
     crash_recovery()
-    copyAssets(Utils.getABI)
+    copyAssets(System.getABI)
     Utils.runCommand("chmod 755 /data/data/com.github.shadowsocks/iptables\n"
       + "chmod 755 /data/data/com.github.shadowsocks/redsocks\n"
       + "chmod 755 /data/data/com.github.shadowsocks/pdnsd\n"

src/main/scala/com/github/shadowsocks/utils/Utils.scala

@@ -282,31 +282,6 @@ object Utils {
     false
   }
 
-  /**
-   * Get the ABI of the device
-   * @return The ABI of the device, or ARM_ABI if not found
-   */
-  def getABI: String = {
-    val prop = getSystemProperty(ABI_PROP)
-    prop match {
-      case abi if abi.toLowerCase.contains(ARM_ABI) => ARM_ABI
-      case abi if abi.toLowerCase.contains(X86_ABI) => X86_ABI
-      case _ => ARM_ABI
-    }
-  }
-
-  /**
-   * Returns a SystemProperty
-   *
-   * @param propName The Property to retrieve
-   * @return The Property, or NULL if not found
-   */
-  def getSystemProperty(propName: String): String = {
-    val p: Process = Runtime.getRuntime.exec("getprop " + propName)
-    val lines = scala.io.Source.fromInputStream(p.getInputStream).getLines()
-    if (lines.hasNext) lines.next() else null
-  }
-
   /**
    * Check the system's iptables
    * Default to use the app's iptables