Return correct key code for delete/backspace on android.

Also increased minimum Android API version to 14.

examples/android/AndroidManifest.xml

@@ -7,11 +7,11 @@
 
     <uses-feature android:glEsVersion="0x00010001" />
 
-    <uses-sdk android:minSdkVersion="9"
+    <uses-sdk android:minSdkVersion="14"
               android:targetSdkVersion="19" />
 
     <uses-permission android:name="android.permission.VIBRATE" />
-    
+
     <application android:label="@string/app_name"
                  android:icon="@drawable/sfml_logo"
                  android:hasCode="false"

examples/android/jni/Application.mk

@@ -1,5 +1,5 @@
 NDK_TOOLCHAIN_VERSION := 4.9
-APP_PLATFORM := android-9
+APP_PLATFORM := android-14
 APP_STL := c++_shared
 APP_ABI := armeabi-v7a
 APP_MODULES := sfml-activity sfml-example