DroidFish: Implemented chmod using JNI. More efficient than starting a process.

DroidFish/src/org/petero/droidfish/engine/EngineUtil.java

@@ -43,4 +43,7 @@ public class EngineUtil {
             abi = "armeabi"; // Unknown ABI, assume original ARM
         return "stockfish-" + abi;
     }
+
+    /** Executes chmod 744 exePath. */
+    final static native boolean chmod(String exePath);
 }

DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java

@@ -240,12 +240,7 @@ public class ExternalEngine extends UCIEngineBase {
     }
 
     private final void chmod(String exePath) throws IOException {
-        Process proc = Runtime.getRuntime().exec(new String[]{"chmod", "744", exePath});
-        try {
-            proc.waitFor();
-        } catch (InterruptedException e) {
-            proc.destroy();
+        if (!EngineUtil.chmod(exePath))
             throw new IOException("chmod failed");
-        }
     }
 }