Updated Android build tools version, which bumped minimum deployment target to API 14

Also added native code to the Android gradle project, which allows using gradle or Android Studio to build the entire SDL application without a separate ndk-build step.

android-project/app/build.gradle

@@ -1,14 +1,19 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.1"
+    compileSdkVersion 16
+    buildToolsVersion "26.0.1"
     defaultConfig {
         applicationId "org.libsdl.app"
-        minSdkVersion 10
+        minSdkVersion 14
         targetSdkVersion 16
         versionCode 1
         versionName "1.0"
+        externalNativeBuild {
+            ndkBuild {
+                arguments "APP_PLATFORM=android-14"
+            }
+        }
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
     buildTypes {
@@ -19,7 +24,11 @@ android {
     }
     sourceSets.main {
         jniLibs.srcDir 'libs'
-        jni.srcDirs = [] //disable automatic ndk-build call
+    }
+    externalNativeBuild {
+        ndkBuild {
+            path 'jni/Android.mk'
+        }
     }
     lintOptions {
         abortOnError false
@@ -27,7 +36,7 @@ android {
 }
 
 dependencies {
-    compile fileTree(dir: 'libs', include: ['*.jar'])
+    compile fileTree(include: ['*.jar'], dir: 'libs')
     androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
         exclude group: 'com.android.support', module: 'support-annotations'
     })

android-project/app/jni/Application.mk

@@ -6,4 +6,4 @@
 APP_ABI := all
 
 # Min SDK level
-APP_PLATFORM=android-10
+APP_PLATFORM=android-14