Update SDL to version 2.0.14.

libs/SDL2/docs/README-android.md

@@ -82,6 +82,23 @@ For more complex projects, follow these instructions:
 
 4b. If you want to build manually, run './gradlew installDebug' in the project directory. This compiles the .java, creates an .apk with the native code embedded, and installs it on any connected Android device
 
+
+If you already have a project that uses CMake, the instructions change somewhat:
+
+1. Do points 1 and 2 from the instruction above.
+2. Edit "<project>/app/build.gradle" to comment out or remove sections containing ndk-build
+   and uncomment the cmake sections. Add arguments to the CMake invocation as needed.
+3. Edit "<project>/app/jni/CMakeLists.txt" to include your project (it defaults to
+   adding the "src" subdirectory). Note that you'll have SDL2, SDL2main and SDL2-static
+   as targets in your project, so you should have "target_link_libraries(yourgame SDL2 SDL2main)"
+   in your CMakeLists.txt file. Also be aware that you should use add_library() instead of
+   add_executable() for the target containing your "main" function.
+
+If you wish to use Android Studio, you can skip the last step.
+
+4. Run './gradlew installDebug' or './gradlew installRelease' in the project directory. It will build and install your .apk on any
+   connected Android device
+
 Here's an explanation of the files in the Android project, so you can customize them:
 
     android-project/app
@@ -90,10 +107,12 @@ Here's an explanation of the files in the Android project, so you can customize
         jni/			- directory holding native code
         jni/Application.mk	- Application JNI settings, including target platform and STL library
         jni/Android.mk		- Android makefile that can call recursively the Android.mk files in all subdirectories
+        jni/CMakeLists.txt	- Top-level CMake project that adds SDL as a subproject
         jni/SDL/		- (symlink to) directory holding the SDL library files
         jni/SDL/Android.mk	- Android makefile for creating the SDL shared library
         jni/src/		- directory holding your C/C++ source
         jni/src/Android.mk	- Android makefile that you should customize to include your source code and any library references
+        jni/src/CMakeLists.txt	- CMake file that you may customize to include your source code and any library references
         src/main/assets/	- directory holding asset files for your application
         src/main/res/		- directory holding resources for your application
         src/main/res/mipmap-*	- directories holding icons for different phone hardware