updated to latest SDL2 (f9244b2a151)

jni/SDL2-2.0.3/docs/README-cmake.md

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+CMake
+================================================================================
+(www.cmake.org)
+
+SDL's build system was traditionally based on autotools. Over time, this
+approach has suffered from several issues across the different supported 
+platforms.
+To solve these problems, a new build system based on CMake is under development.
+It works in parallel to the legacy system, so users can experiment with it
+without complication.
+While still experimental, the build system should be usable on the following
+platforms:
+
+* FreeBSD
+* Linux
+* VS.NET 2010
+* MinGW and Msys
+* OS X with support for XCode
+
+
+================================================================================
+Usage
+================================================================================
+
+Assuming the source for SDL is located at ~/sdl
+
+    cd ~
+    mkdir build
+    cd build
+    cmake ../sdl
+
+This will build the static and dynamic versions of SDL in the ~/build directory.